A refrigerator uses 150W. If it is kept on for 336 hours nonstop. What is the energy consumed in Kwh?
Question 1 Report
A refrigerator uses 150W. If it is kept on for 336 hours nonstop. What is the energy consumed in Kwh?
Answer Details
Electrical energy consumed is calculated using the formula:
\[ E = P \times t \]
where \( P \) is power in watts and \( t \) is time in hours (when the result is needed in watt-hours).
Given:
- Power, \( P = 150 \text{ W} \)
- Time, \( t = 336 \text{ hours} \)
\[ E = 150 \times 336 = 50{,}400 \text{ Wh} \]
Convert to kilowatt-hours by dividing by 1000:
\[ E = \frac{50{,}400}{1000} = 50.40 \text{ kWh} \]
The energy consumed is 50.40 kWh.
When calculating energy in kWh, ensure power is converted from watts to kilowatts (divide by 1000) either before or after multiplication. Using \( P \) in kW from the start: \( 0.15 \times 336 = 50.40 \text{ kWh} \), which confirms the answer.
Download The App On Google Playstore
Everything you need to excel in your exams
