Consider an electrical current, I, flowing through a resistor of resistance, R, because there is a potential difference, V, across the component.
a. a For each Coulomb of charge that flows through the resistor, how many Joules of electrical energy are transferred to thermal energy to increase the temperature of the resistor?
b. b In 1 s, how many Coulombs of charge flow past any given point in the resistor?
c. c So, write an expression for how many Joules of electrical energy are transformed into thermal energy every second in the resistor.
d. d Hence, show that the power generated in the resistor can be written as
- i P=I2R .
- ii P=RV2 .