Question

A 1,200-watt water heater is plugged into a 120-volt outlet and used for 1.5 hours. How much current runs through the water heater?

Answer 1

Answer:

Current (i) = 10 Ampere

Explanation:

As we know that power consumed by the electrical heater is given by the rate of electrical energy consumed by it.

So as we know that electrostatic potential energy of charge is given by

$U = qV$

now for electrical power we know that

$P = \frac{dU}{dt}$

$P = \frac{d}{dt}(qV)$

$P = V\frac{dq}{dt}$

$P = Vi$

so now by plug in data in this above equation we have

$1200 = 120 \times i$

$i = 10 A$

so current through the water heater will be i = 10 A

Answer 2

Current = power/voltage = 1200w/120v = 10 amperes. Constantly. Whenever the heater is turned on and heating.