State Joule’s law of heating. List two special characteristics of a heating element wire. An electronic iron consumed energy at the rate of 880 W when heating is at the maximum rate and 440 W when the heating is at the minimum rate. The applied voltage is 220 V. Calculate the current and resistance in each case
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Joule's law of heating depicts that :
- The heat generated is directly proportional to the square of current.
- It is directly proportional to the resistance.
- It is directly proportional to the time.
- H = I^2 RT
Explanation:
P = VI
880W = 220 V × I
880/220 = I
I = 4A
V = IR
220 = 4 × R
220/4 = R
R = 55 Ohm
P = VI
440 = 220 × I
440/220 = I
I = 2 A
V = IR
220 = 2 ×R
220/2 = R
R = 110 Ohm
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