Ohm's Law
Class 10 Science: electricity (Ohm's law)
Change the voltage and the resistor, read the ammeter and plot your own V-I graph.
Words to know
- Current (I)
- The flow of electric charge, measured in amperes (A) with an ammeter.
- Voltage (V)
- The push that drives current, measured in volts (V).
- Resistance (R)
- How much a component opposes current, measured in ohms (Ω).
- Ohm's law
- V = I × R: for a fixed resistor, current is proportional to voltage.
Quick check
Answer 3 questions to check what you learned.
Try at home
Look at a phone charger or a bulb box. Find the volts (V), amps (A) or watts (W) printed on it. Power in watts = volts × amps.