3 29 A transformer is used to light 140W 24V lamp from 240V a c mains The current in the mains cable is 0 7A The efficiency of

Question

3 29 A transformer is used to light 140W 24V lamp from 240V a c mains The current in the mains cable is 0 7A The efficiency of transformer is 2 48 1 63 8 3 83 3 4 34

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