Question

Define electric power. Express it in terms of potential difference (V) and resistance (R).

An electric oven is designed to work on the mains voltage of 220 V. This oven consumes 11 units of electrical energy in 5 hours. Calculate : (a) power rating of the oven (b) current drawn by the oven (c) resistance of the oven when it is red hot

A 2000 W heater has a resistance of about 25 Ω, whereas a 100 W bulb has a resistance of 500 Ω. When 220 V is applied on these, then which of the two

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given in the following table : I (Amperes): 0·5, 1·0, 2·0, 3·0, 3·5 V (Volts): 1·5, 3·0, 6·2, 9·3, 10·8

The potential difference across the two ends of a circuit component is decreased to one-third of its initial value, while its resistance remains constant. What change will be observed in the current flowing through it? Name and state the law which helps us to answer this question.