What are circuit diagrams used for?
To show how electrical components are connected in a circuit
Individual circuit components are represented using circuit symbols.
What device is used to measure the current flowing through components?
Ammeter
Ammeters are connected into a circuit using wires, like any other component.
What device is used to measure the potential difference across components?
Voltmeter
Potential difference is also commonly called ‘voltage’.
What is the unit of current?
Amperes (A)
A current of 1.5 amps can be written as 1.5 A.
What is the unit of potential difference?
Volts (V)
A potential difference of 1.5 volts can be written as 1.5 V.
How are ammeters connected in a circuit?
In series
The ammeter can be placed anywhere in a series circuit.
How are voltmeters connected in a circuit?
In parallel
A voltmeter cannot be connected in series with other components.
What is the most common type of cell?
Electrochemical cell
This type of cell uses chemical reactions to transfer energy.
What happens when a circuit is connected correctly?
An electrical current flows
An electrical current in a wire is a flow of electrons.
Fill in the blank: Cells provide the energy for many electrical devices to function, such as _______.
torches, mobile phones, laptops
Cells come in different sizes and shapes.
What is the relationship between the flow of electrons and the current?
The more electrons flow through a wire each second, the greater the current
Current is measured using an ammeter.
What is the symbol for volts?
V
The potential difference produced by a cell or battery can be measured using a voltmeter.
What does a voltmeter measure?
Potential difference
It measures the potential difference across a component by connecting leads to each side.
True or false: An ammeter can be connected in parallel with other components.
FALSE
An ammeter must be connected in series.
What do circuit symbols represent?
Individual circuit components
Circuit diagrams use these symbols to show connections.
