A heating element in a stove (a resistor) is designed to dissipate 3 000 W when connected to 240 V. (a) Assuming the resistance is constant, calculate the current in the heating element if it is connected to 120 V. (b) Calculate the power it dissipates at that voltage.
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Given in question - Initial Power(Pi) = 3,000 W
Initial volatage(Vi)= 240 V
Final voltage(Vf) = 120 V
To find - (a). Assuming the resistance is constant, calculate the current in the heating element if it is connected to 120 V.
(b). Calculate the power it dissipates at that voltage.
Solution: Step1 - Here, we will solve part (a) of the question.
As we know that, Power is given by -
Pi =
R =
Using ohm's law we will find current -
if =
Hence, the current in the heating element, if it is connected to 120 V, will be (6.25 ampere).
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