What's the difference between calculating power with different given variables?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The approach changes based on what information you have:
|
Given Variables |
Formula |
Best For |
|
Mass, height, time |
P = (m × g × h) / t |
Lifting objects vertically |
|
Mass, velocity, time |
P = (½mv²) / t |
Kinetic energy scenarios |
|
Voltage, current |
P = V × I |
Basic electrical circuits |
|
Current, resistance |
P = I² × R |
When voltage is unknown |
|
Force, velocity |
P = F × v |
Mechanical work scenarios |
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