Question

an electric heater runs for 15 minutes with a current of 2A, what is the potential difference across the electric heater if it transfers 2.16x10^4 J of energy?

Answer 1

To find the potential difference across the electric heater, we can use the formula:

Power (P) = Current (I) * Potential Difference (V)

We know that the Power is given by the equation:

Power (P) = Energy (E) / Time (t)

Given that the electric heater transfers 2.16x10^4 J of energy in 15 minutes (or 900 seconds), we can calculate the Power as:

Power (P) = 2.16x10^4 J / 900 seconds

P = 24 J/s

Given that the current is 2A, we can now calculate the Potential Difference (V) using the formula:

V = P / I

V = 24 J/s / 2A

V = 12 V

Therefore, the potential difference across the electric heater is 12 volts.