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?
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.