Convential symbols are used to show different components which are standard across the electrical industry. This makes it quick and easy to construct circuit diagrams - certainly a lot quicker than drawing a picture of it! It also makes it easier to construct real circuits from the drawings.
In this worksheet we'll try working out circuit diagrams from descriptions of circuits, and drawings of them, and we'll also try SERIES and PARALLEL circuits. Series circuits have all the components in a single loop so the same current goes through everything:
Parallel circuits have different branches which means that different components can be on each branch and so can be controlled individually:
Look at this circuit carefully:
Which one of the following descriptions of how the circuit works is correct?
Here are the same three circuits:
Imagine that the switches in all the circuits have been closed.
Tick which bulbs are on now that the switches have been closed.
Here is a description of an electric circuit:
"The circuit has two cells, two switches and two bulbs. When one switch is closed one bulb goes on and when both the switches are closed both the bulbs are on."
Which of these three circuits correctly matches the description of how this circuit works?
Here is a description of another electric circuit:
"The circuit has two cells, two switches, one bulb and a motor. When one switch is closed the bulb goes on and the motor turns. When both switches are closed the motor continues to spin but the bulb goes out."
Which of these three circuits correctly matches the description of how the circuit works?