A light bulb uses 60 W of power. How much energy does it consume in 2 hours?
Practice Questions
1 question
Q1
A light bulb uses 60 W of power. How much energy does it consume in 2 hours?
120 J
7200 J
432000 J
360 J
Energy consumed can be calculated using E = P * t. Here, P = 60 W and t = 2 hours = 7200 seconds. Thus, E = 60 W * 7200 s = 432000 J.
Questions & Step-by-step Solutions
1 item
Q
Q: A light bulb uses 60 W of power. How much energy does it consume in 2 hours?
Solution: Energy consumed can be calculated using E = P * t. Here, P = 60 W and t = 2 hours = 7200 seconds. Thus, E = 60 W * 7200 s = 432000 J.
Steps: 5
Step 1: Understand that power (P) is the rate at which energy is used. In this case, the light bulb uses 60 watts (W) of power.
Step 2: Know that energy (E) can be calculated using the formula E = P * t, where E is energy, P is power, and t is time.
Step 3: Convert the time from hours to seconds because power is in watts (which is joules per second). 2 hours = 2 * 60 minutes/hour * 60 seconds/minute = 7200 seconds.
Step 4: Substitute the values into the formula: E = 60 W * 7200 s.
Step 5: Calculate the energy: E = 60 * 7200 = 432000 joules (J).
