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The heating element on an electric iron has a resistance of 24 ohm and draws a current of 5.0 A. How much work is done if the iron is used for 45 minutes?
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The heating element on an electric iron has a resistance of 24 ohm and draws a current of

5.0 A. How much work is done if the iron is used for 45 minutes?

User Jeff L
by
5.2k points

1 Answer

5 votes

Answer:

1620000J

Step-by-step explanation:

Given parameters:

Resistance = 24ohm

Current = 5A

Time = 45min

Unknown:

Work done = ?

Solution:

Electrical work done is given as the product of power with time;

Electrical work done = power x time

Power = I²R

Electrical work done = I²R x time

Convert the given time to seconds;

1min = 60s

45 min = 45 x 60 = 2700s

Now,

Work done = 5² x 24 x 2700 = 1620000J

User Rudolf Lamprecht
by
5.1k points
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