Current Electricity Questions and Answers

Justine s hair dryer has a resistance of 17 50 when first turned on How much current does the hair dryer draw from 110 V line in Justine s house

A current of 10 amperes is a flow of charge at the rate of coulomb per second

a b C d 4 3 A 6 3 A 12 6 A 24 Three resistors having values of 4 6 and 8 ohms are connected in series What is their equivalent 1 8 ohms 6 ohms 8 ohms 18 ohms a b C d 892 arallel What is their equiv

802 Three resistors having values of 4 6 and 10 ohms are connected in parallel What is their equivale a 0 52 ohms b 1 9 ohms 6 7 ohms C d 20 ohms 1540 452 Voltage V 652 ONA 1 10 2 2 3 Current A 4

4 An 8 0 ohm resistor and a 6 0 ohm resistor are connected in series with a battery The potential difference across the 6 0 ohm resistor is measured as 12 V a Find the total resistance of the circuit b Find the current in the 6 0 ohm resistor c Find the potential difference across the battery

5 A 9 0 ohm resistor and a 6 0 ohm resistor are connected in parallel to a battery and the current in the 9 0 ohm resistor is found to be 0 25 A a Find the voltage drop across the battery b Find the current in the 6 0 ohm resistor

6 A resistor with an unknown resistance in connected in parallel to a 12 ohm resistor When both resistors are connected to a battery of 1 the current in the unknown resistor is measured to be 3 0 A What is the resistance of the unknown resistor

1 Two resistors one 130 ohm and the other 210 ohm are connected in parallel The resistors are then connected to a battery If the current through the entire circuit is 0 31 A what is the voltage of the battery

4 A 25 ohm resistor a 55 ohm resistor and a 75 ohm resistor are connected in parallel and placed across a 9 0 V battery a What is the equivalent resistance of the parallel circuit b What is the current through the entire circuit c What is the current through each branch the circuit

hich of the following diagrams represents resistors connected in parallel Enter the letter Diagram A Diagram B Diagram C m m m mm m

What effect will adding more light bulbs in parallel have upon the overall resistance of a circuit Select one O a As more light bulbs are added in parallel the overall resistance increases O b As more light bulbs are added in parallel the overall resistance decreases O c Its not that simple to predict one must know if they are round bulbs or long bulbs O d Adding more light bulbs in parallel will have no affect upon the overall resistance

The diagram at the right shows two identical resistors R and R2 placed in a circuit with a 12 Volt battery a These two resistors are connected in R1 W 1 12 V R2 b The electric potential difference voltage drop across each resistor is Volts c If a third resistor R3 identical to the other two is added in series with the first two then the overall resistance will and the overall current will d If a third resistor R3 identical to the other two is added in series with the first two then the electric potential difference voltage drop across each of the three individual resistors will

A simple circuit consists of a 12 volt battery two ammeters and a 2 ohm resistor Determine the current 12 V A 292

If you connect in series three resistors with the values of 16 0 22 0 and 32 0 what value must the fourth resistor have for the equivalent resistance to equal 83 0

Battery and a 12 ohm resistor are connected as shown in circuit X below Two 12 ohm resistors are connected as shown in circuit Y Circuit X 12 V The current in the battery in circuit X is Select one O a twice O b 2 O C 2 3 O d three times 12 22 the same as 12 V Holl Circuit Y 12 22 that in the battery in circuit Y 12 92

Three resistors are connected in series across a 75 V potential difference R is 170 0 and R is 190 0 potential difference across R3 is 21 V Find the current in the circuit Answer Check Find the resistance of R3

Consider circuits X and Y below Each circuit is powered by the same battery and contains identical resistors Select one The current in the battery in X will be a the same as Ob less than c Circuit X greater than that in the battery in Y Circuit Y w Lud 11

A simple circuit consists of a 12 volt battery an ammeter and a resistor The ammeter reads 3 amps Determine the resistance of the resistor Don t include the unit 12 VE L 3 A

A lamp with a resistance of 8 Q is connected across a 24 V battery What is the current through the lamp Answer Check What resistance must be connected in series with the lamp to reduce the current to 1 6 A

Three 25 0 Q resistors are connected in series across a 60 0 V battery What is the current in the circuit

A 12 0 resistor and a 28 0 resistor are connected in series across a battery The current in the circuit is 0 90 A What is the voltage drop across the 12 0 resistor

Find the total resistance in the circuit Find the total current through the circuit Answer Check Find the voltage drop across the 150 resistor Answer Check

Which has more resistance when plugged into 120 V line a 1400 W microwave oven or a 150 W electric can opener microwave can opener

Calculate the time it takes for 44 7 C to drift through a wire carrying 11 A

A current is said to exist whenever Select one O a electric charges are unbalanced O b electric charges move in a loop a wire is charged O d a battery is present O c

Arthur is going trick or treating for Halloween so he puts new batteries in his flashlight before leaving the house Until the flashlight shuts off it draws 7 A of current allowing a total of 443 C of charge to flow through the circuit How long will Arthur be able to use the flashlight before the batteries energy is depleted

Justine s hair dryer has a resistance of 19 40 when first turned on How much current does the hair dryer draw from 110 V line in Justine s house

Water doesn t flow in the pipe when a both ends are at the same level Another way of saying this is that water will not flow in the pipe when both ends have the same potential energy PE Similarly charge will not flow in a conductor if both ends of the conductor are at the same electric potential But tip the water pipe and increase the PE of one side so there is a difference in PE across the ends of the pipe as in b and water will flow Similarly increase the electric potential of one end of an electric conductor so there is a potential difference across the ends and charge will flow potential of one end of an electric conductor so there is a potential difference across the ends and charge will flow For questions 3 6 enter the correct term only The units of electric potential difference are volts amperes ohms watts Answer CO b FOCO 02

Achieve3000 What is the total current for the circuit shown below H H 12 V 02A 12 A Pandora Listen to Google Slides Free Dashboard 04A O 0 2 A 6 0 92 1292 36 218 2

4 Find the current through a resistor of resistance R 4 2 if the voltage across the resistor is 8 V

What is the approximate cost of operating a 40 W light bulb for 3 0 h per day for 1 week if the price of electrical energy is 6 kWh 1 Point O 7 O 50 04 O 0 7 O 5

Given the following circuit what is the total current R 222 R 802 R3 29 02 IT A VT 199 V R R MA Round your answer to the nearest 0 1 Do not include units Be VERY careful when rounding Keep all digits until you re ready to round your FIN ANSWER

Fill in the blanks on the table below for a series circuit Round your answers to the nea 0 1 Do not add units Voltage V 1 2 3 Total 2 4 24 Current A 2 4 Resistance 2 3

The figure shows part of a circuit It is a junction at which four branches join The currents in three of the branches are given as 1 3 A 12 4 A 13 4 A Find the current i4 in the fourth branch 14 Check A Can you please solve the problem and explain

Design an experiment based on one of the following simulations Ohm s Law Pendulum Lab Resistance in a wire Interfering waves Doppler Lab Power of a lightbulb Include the following in your lab instructions The purpose of the experiment 0 Explicitly identify the variables being studied Identify controlled variables o Create a data table Include a graph if appropriate actions 4

An electric heater carries a current of 15 0 A when operating at a voltage of 2 70 x 102 V What is the resistance of the heater XQ

What is the equivalent resistance when switch 2 is open

12 A 13 cm long current carrying conductor with a weight of 5 5 N is placed in a 6 T magnetic field that is pointed west What is the current in the wire 13 In what direction must a magnetic field be pointed in order to increase the speed of an electron that is traveling North through it and the Force is out of the Earth

A 5 00 V power supply provides a maximum current of 9 90 A HINT a Calculate the maximum power delivered in W by the power supply b How many 1 77 W cell phone chargers could be powered by the power supply Include fractional numbers in you chargers

HINT a What average current in A does the phone draw from its battery 358 The three equivalent expressions for electrical power are linked by Ohm s law P IAV 1 R AV A b Calculate the energy in J stored in a fully charged battery if the phone requires charging after 9 03 hours of use 36377 28 XJ Need Help Read It Watch It

Nichrome wire of cross sectional radius 0 779 mm is to be used in winding a heating coil If the coil must carry a current of 8 50 A when a voltage of 1 50 x 102 V is applied across its ends find t following a the required resistance of the coil 17 64 2 b the length of wire you must use to wind the coil X Your response differs from the correct answer by more than 10 Double check your calculations m Need Help Read It

A closed cubical box is made by a thin conducting sheet When its diagonally opposite corners are connected across a battery it draw a current from the battery Find current flowing across the edge BE 119 A H G D E B D Between and

Find the charge on the capacitor in an LRC series circuit at t 0 04 s when L 0 05 h R 3 C 0 008 f E t 0 V q 0 3 C and i 0 0 A Round your answer to four decimal places 2 5892 X C Determine the first time at which the charge on the capacitor is equal to zero Round your answer to four decimal places 0 0554 S

2 Is Ohm s low verified for a parallel circuit 2 What are the disadvantages with parallel circuits

15 0 01 A causes involuntary muscle contractions The resistance of dry human skin is about 500 000 ohms and wet sweaty human skin is about 1000 ohms How much voltage is required to cause involuntary muscle contractions on dry skin

A 15 resistor R and a 30 resistor R are to be connected in parallel between points A and B in a circuit containing a 90 volt battery A Complete the diagram to show the two resistors connected in parallel between points A and B B Determine the potential difference across resistor R C Calculate the current in resistor R A B uv R HIIH Copy link 90 V YouTube MULTIPLE CHOICE QUESTION What is the potential difference across R1 30 V 1 90 V 90 V 45 V

ectric energy will be used by a 115V 60W lightbulb in 1 minute 7 An electric heater rated at 4800 W is operated on 120 volts What is the resistance How much energy is used by this heater in 10 seconds 8 A 110 volt toaster oven draws a current of 6 amps on its highest setting as it converted electrical energy into thermal energy What is the toaster s maximum power rating

Particles q1 53 0 C q2 105 C and 93 88 0 C are in a line Particles q and q2 are separated by 0 50 m and particles q2 and q3 are separated by 0 95 m What is the net force on particle q1 Remember Negative forces F will point Left Positive forces F will point Right 53 0 C 91 05 105 C 92 0 95 m 88 0 C 93

7 What is the increase of current when 15 V is applied to 10000 Q2 rheostat which is then adjusted to 1000 Q2 A rheostat is an adjustable resistor that can change the amount of current flowing without opening the circuit Hint Calculate the current with both resistance values and subtract the smaller current from the larger current

current into ground ib 12 3mA R3 1k R1 2 667k MA R2 3k 11 2mA