P4 Electrical circuits Flashcards
What does a cell do?
It pushes electrons around a complete circuit.
How many cells does a battery consist of
2 or more
What does a switch do
Enables the current to be turned on and off
What does a bulb do
It emits light as a signal when a current passes through it
What does a diode do
It only allows the current to flow in one direction
What does an LED do
It emits light when a current passes through it
What does an ammeter do?
It measures an electric current through something
What does a fixed resistor do?
It Limits the current in a circuit
What does a variable resistor do?
It allows the current to be manually adjusted (the amount of resistance)
What does a fuse do?
It melts and breaks the circuit if the current flowing through it is too high
What does a heater do?
It transfers the energy from an electrical current to heat the surroundings
What does a voltmeter do?
It measures the potential difference across (a bulb) (Voltage)
Does a single closed loop circuit have the same current all the way the way through?
Yes
What does it mean if the ammeter is connected in series with the bulb
That its on the same straight line of a circuit
What does it mean if an voltmeter measures the potential difference across a bulb
That the voltmeter is connected in parallel with the bulb
