An electric heater with a p.d of 240V connected across its terminals has a total resistance of 950Ω .
Find the power rating of the heater?
P = EI = I^2R = E^2/R
watts = (volts)^2 / Ω
To find the power rating of the electric heater, we can use the formula:
Power (P) = (Voltage * Voltage) / Resistance
Given that the potential difference (p.d) across the terminals of the heater is 240V, and the total resistance is 950Ω, we can substitute these values into the formula:
P = (240^2) / 950
To simplify the calculation, first square the voltage:
P = (57600) / 950
Now divide the result by the resistance:
P ≈ 60.63 Watts
Therefore, the power rating of the electric heater is approximately 60.63 Watts.