Electricity and Resistance Flashcards
The circuit carries energy from the battery or power supply to what?
Give examples
To components eg lamps and motors
What is electricity around a circuit?
A flow of charge
Electricity can flow only if the circuit is what?
Complete
What is a complete circuit?
Battery through wires to components and back to battery
What happens when the switch is open?
The circuit is broken, electricity cannot flow and the lamp is off
What happens when the switch is closed?
The circuit is complete allowing electricity to flow and the lamp is on the electricity is carrying energy from the battery to the lamp
What way does electricity flow?
From the positive terminal to the negative
What is the unit of voltage?
Volt
What is the unit of current?
Ampere (Amp)
Describe voltage and current
The switch is closed making a complete circuit so current can flow
Describe Voltage but no current
The switch is open so the circuit is broken and current cannot flow
Describe no voltage no current
Without the cell there is no source of voltage so the current cannot flow
Complete this sentence.
Resistance is the property which _________.
Which restricts the flow of electrical current
What is resistance measured in?
Ohms (an omega symbol)
Give the resistor values colour code represent (4 bands)
1st band: the first digit
2nd band: the second digit
3rd band: the number of zeros
4th band: how accurate
