Question

1. a 2200 w heater is left on for 5 minutes. how many joules are expended?

Explanation:

Step1: Recall the formula for energy

The formula relating power (\(P\)), energy (\(E\)), and time (\(t\)) is \(E = P\times t\). Power is in watts (W), time in seconds (s), and energy in joules (J).

Step2: Convert time to seconds

Given time \(t = 5\) minutes. Since 1 minute = 60 seconds, \(t = 5\times60 = 300\) seconds.

Step3: Substitute values into the formula

Power \(P = 2200\) W, time \(t = 300\) s. So \(E = 2200\times300\).

Step4: Calculate the energy

\(2200\times300 = 660000\) joules.

Answer:

660000