Voltage
What is the unit of voltage?
Volts (V)
What is the flow of electric charge called?
Current
What unit is resistance measured in?
Ohms
V = I * R. What do the letters stand for?
Voltage, Current, Resistance
What kitchen appliance uses Ohm's Law to generate heat?
Toaster/Oven/Electric Kettle/etc.
Define electric current.
Electric current is the flow of electric charge, typically carried by electrons, through a conductor.
What is the symbol of resistance?
Ω
If V = 6V and R = 2 ohms, what is I?
3amps
What is a resistor and what is its function in a circuit?
A resistor is an electrical component that opposes the flow of electric current. Its function is to control the amount of current flowing through a circuit.
If I = 4A and R = 3 ohms, what is V?
12 Volts
If a 9-volt battery is connected to a resistor with a resistance of 3 ohms, what is the current flowing through the resistor?
3 Amps (I = V / R = 9V / 3 ohms = 3 Amps)
Explain how a fuse protects a household circuit using Ohm's Law.
A fuse contains a thin metal wire that melts when the current flowing through it exceeds a safe level. This breaks the circuit, preventing excessive current from damaging electrical components or causing a fire. Ohm's Law helps determine the appropriate current rating for the fuse based on the circuit's voltage and the resistance of the connected devices.