ELECTRICITY-SOLVE

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

• (a) 440 W

• (b) 110 W

• (c) 55 W

• (d) 0.0023 W

The resistivity of insulators is of the order of

• (a) 10^-8 Ω-m

• (b) 10⁴ Ω-m

• (c) 10^-6 Ω-m

• (d) 10⁶ Ω-m

100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:

• (a) 30 V

• (b) 10 V

• (c) 20 V

• (d) 25 V

Electric potential is a:

• (a) scalar quantity

• (b) vector quantity

• (c) neither scalar nor vector

• (d) sometimes scalar and sometimes vector

1 kWh = ……….. J

• (a) 3.6 × 10^-5 J

• (b) 3.6 × 10⁵ J

• (c) 3.6 × 10⁶ J

• (d) 3.6 × 10^-6 J