Electrical Systems
• An electric circuit consists of a power source and other circuit components (dry
cells, wires, bulbs, switches). These form an electrical system.
• Different symbols in a circuit diagram are used to represent the circuit components in
an electric circuit.
Actual components used in a circuit
Circuit diagram
batteries
bulb
switch
batteries
bulb
switch
• A current can only flow through a closed circuit.
• A simple circuit with two bulbs and an electric source can be arranged either in
series or parallel.
• Changing the number or arrangement of components of an electrical system can
affect the current in a circuit and the brightness of bulbs.
• Electrical conductors allow electricity to flow through.
• Good conductors of electricity are generally good conductors of heat.
• Electrical insulators do not allow electricity to flow through.
• A circuit tester is used to find out if electricity is flowing through a circuit.
• Electricity should be used properly and handled appropriately.
• There is a need to conserve electrical energy.
Adapted:
Science Partner Upper Block 5/6
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