WHAT IS IT?
This is defined as the flow or movement of electric charge.
Electricity
Standard unit used to measure voltage.
Volt (V)
Voltage matches this water property.
Pressure
If R stays same, V increases → I does this.
Increases
Thin, high‑resistance wire inside a bulb.
Filament
Term for the “electrical push” or pressure that makes charges move.
Voltage
Letter symbol used in formulas for current.
I
Current matches this water property.
Flow rate / amount moving
Rearrange V = I×R to solve for R.
R = V ÷ I
Why are connecting wires made low‑resistance?
So current flows easily & less energy lost
The amount or rate of charge passing through a point every second.
Electric Current
Full name and symbol for resistance’s measurement unit.
Ohm (Ω)
Resistance matches this pipe feature.
Narrowness / friction / blockage
Rearrange V = I×R to solve for I.
I = V ÷ R
Component added on purpose to limit current.
Resistor
Any property or part that slows or opposes charge flow.
Resistance
Unit of Electric current
Ampere
Same pipe size, higher water pressure → what happens to flow?
It increases / more flow
12 V, 4 Ω → find current.
3 A
Wire directly across battery, almost zero resistance → dangerous?
Short circuit / very high current / overheat
Negatively‑charged tiny particles that actually move inside wires.
Electrons
Formula form of Ohm’s Law.
V = I × R
Same pressure, pipe becomes much narrower → result for resistance and current?
Resistance rises, current or flow decreases
6 V vs 12 V, same wire/resistance → how much more current?
Twice as much / 2×
How does resistance make a bulb light?
Opposes electrons → energy changes to heat & light