7J Electricity Flashcards
Name the piece of equipment that measures how much current is flowing around a circuit.
The piece of equipment that measures how much current is flowing around a circuit is called an ammeter
What is the unit for measuring current?
Current is measured in Amperes, or Amps (A) for short.
Two or more cells used together.
battery
A source of electricity with a low ‘energy’ (low voltage). Cells push electrons round a circuit.
cell
What do you call the flow of electricity around a circuit.
The flow of electricity around a circuit is called current.
What’s the name of the thin piece of wire inside a light bulb that glows when the bulb is on.
The thin piece of wire inside a light bulb that glows when the bulb is on is called the filament.
What’s the name of the tiny chatged particles that flow around a circuit?
The name of the tiny chatged particles that flow around a circuit is electrons.
What’s this kind of circuit called?
There is more than one way thyat the current can flow.
This kind of circuit is called a parallel circuit.
What’s this kind of circuit called?
There is only one loop of wire, and therefore only one way that the current can flow.
his kind of circuit is called a series circuit
If something has electrical resistance, what does this mean?
Resistance means the way some things try to stop electricity flowing through them. They resist the current.
It is difficult to floe though something with high resistance.
What do you call a component whose resistance can be changed?
A component whose resistance can be changed is called a variable resistor. You can vary the resistance.
What’s the word that describes the energy transferred by the charges?
The word that describes the energy transferred by the charges is voltage.
Energy can be goiven to the charges by a battery, or lost by the charges in a bulb.
What’s the piece of equipment that measures how much energy is being transferred by the charges?
The piece of equipment that measures how much energy is being transferred by the charges? voltmeter.
What’s the name of the green and yellow wire in a cable or plug. It is there for safety.
The green and yellow wire in a cable or plug is called the earth wire
What’s the name of the piece of wire that melts if too much electricity flows through it.
The device found in a plug which will melt, and turn off the circuit, is called a fuse
What’s the name of the brown wire in a cable or plug.
The name of the brown wire is the live wire
What’s the name of the blue wire in a cable or plug.
The name of the blue wire is the neutral wire
What can you say about the current in a series circuit?
The current in a series circuit is the same everywhere. There is only one loop, so it has only one path it can take.
If the current in ammeter 1 (A1) is 3 Amps (3A), what would the current be in A2?
The current in A2 would also be 3 Amps, as it is a series circuit, so the current has to be the same everywhere.
What can you say about the current in a parallel circuit?
The current in a parallel circuit splits up at a junction - some current goes one way and some goes the other. It always has to add up to the current that left the vattery though. Current does not get ‘used up’!!
What would the current in in A2, A3 and A4, if the current in A1 is 4A?
It’s a parallel circuit, so the current splits. There is the same branch on each circuit, so the current splits equally, 2A in A2 and 2A in A3. The current then joins up again so it is 4A in A4.
Name this circuit symbol.
An ammeter
Name this circuit symbol.
A switch
Name this circuit symbol.
A voltmeter
Name this circuit symbol.
A cell.
If you add bulbs to a series circuit, what happens to the brightness of the bulbs? Can you explain this?
If you add bulbs to a series circuit, the brightness of the bulbs gets less. Adding more bulbs in series makes the resistance go up, so the current goes down.
If you add bulbs to a parallel circuit, what happens to the brightness of the bulbs? Can you explain this?
If you add bulbs to a parallel circuit, the brightness of the bulbs stays the same. This is because they are all connecetd to the same voltage, so have the same current going through them.
If you unscrew a bulb from 3 in series, what happens to the other 2?
If you unscrew a bulb from 3 in series, wthe other 2 will go out. This is because there is only one loop, so the circuit is broken.
If you unscrew a bulb from 3 in parallel, what happens to the other 2?
If you unscrew a bulb from 3 in parallel, the other 2 stay on. This is because there is more than one loop, so the current can flow the other way.
