Question

1. a 4000 w heater is operated for 30 seconds. how much energy is released?

Explanation:

Step1: Recall the formula for energy (power and time)

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

Step2: Identify the given values

We are given that the power \(P = 4000\space W\) and the time \(t = 30\space s\).

Step3: Substitute the values into the formula

Substitute \(P = 4000\) and \(t = 30\) into the formula \(E = P\times t\). So, \(E=4000\times30\).

Step4: Calculate the product

Calculate \(4000\times30 = 120000\).

Answer:

The energy released is \(120000\) joules (or \(1.2\times 10^{5}\) joules).