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quester [9]
3 years ago
8

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

iance use in 4h
Physics
1 answer:
skad [1K]3 years ago
8 0

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

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