What power means
Power tells us how quickly a circuit is using or delivering electrical energy.
Current & Voltage Course
Lesson 6 of 16: Power in a Circuit
Move step by step through the course and keep track of where you are.
Simulation
Power in a Circuit
Power tells us how fast electrical energy is being used. It depends on both voltage and current.
Voltage
12.0 V
Current
1.50 A
Resistance
8.00 Ohm
Power
18.00 W
Core idea
Power increases when voltage increases, current increases, or both increase together.
Simple idea
More push or more flow usually means more power, because the circuit is doing more work each second.
Power View
Watch power rise and fall
This simulation shows how one result depends on voltage and current together. As those values change, the power level changes too.
Power level
HIGH
Higher power means the circuit is using electrical energy faster.
Formula
P = V x I
P = V x I = 12 x 1.5 = 18 W
Circuit effect
Strong Output
The LED glow becomes stronger when power rises.
What to notice
Power is not a separate mystery value. It is simply the result of voltage and current working together inside the circuit.
Beginner Summary
Keep this power picture in mind
This lesson becomes easier when you remember one simple picture: voltage gives the push, current shows the flow, and power tells you how strongly the circuit is working.
Higher power means the circuit is using electrical energy more quickly. Lower power means the device is doing less electrical work.
More voltage
If current stays the same, more voltage usually means more power.
More current
If voltage stays the same, more current also means more power.