Question

An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.

1. How much charge flows around the circuit each second?
2. How much energy is transferred to the heater each second?

Answer 1

Given: Potential difference = 230 V

Current (I) = 8 A

a. I = `Q/t``

⇒ 8 = Q/1

⇒ Q = 8 × 1

⇒ Q = 8C

Therefore, the charge that flows around the circuit every second is 8 C.

b. We know that,

Energy transferred = Work done

Potential difference = `"Work done"/"Charge moved"`

⇒ 230 = `"Work done"/8`

⇒ Work done = 230 × 8

⇒ Work done = 1840 J

Thus, 1840 joules of energy are transferred to the heater each second.