Question

the current flowing in an appliance connected to a 120V source is 2A. How many kilowatt-hours of electrical energy does the appliance use in 4h

Answer 1

Answer:

0.96 kWh

Explanation:

First of all, we can find the power of the appliance using the formula:

$P=VI$

where

V = 120 V is the voltage of the source

I = 2 A is the current

Substituting,

$P(120 V)(2 A)=240 W = 0.24 kW$

Now we want to find the amount of energy used by the applied in a time of

t = 4 h

The amount of energy is given by

$E=Pt$

where

P = 0.24 kW

t = 4 g

Substituting,

$E=(0.24 kW)(4 h)=0.96 kWh$