Electrical Circuits Flashcards
Resistance is measured in …
How do we calculate resistance?
Ohms
Resistance = potential difference ➗ current
What happens to current if resistance is increased?
Current decreases
If you increase the potential difference, what happens to current?
It increases
What are the moving charges in electrical current?
Negative electrons
Which way does current flow?
Positive to negative
Which way do the electrons flow?
In the opposite direction to current
What do we call materials that electricity can easily travel through?
Conductors
What do we call materials that don’t easily conduct electricity?
Insulators
What is a bulb rating?
The maximum potential difference that can be put across a bulb
How would you place an ammeter differently to a voltmeter in a circuit?
Put an an ammeter into the circuit to measure current. Put a voltmeter across a component such as a bulb to measure potential difference in volts.
What is electrical current?
It is the flow of charge around a circuit
What is the unit of current?
Amp (A)
