3 - Lamp Circuit
A switch can be used to control the following circuit and make it open or closed.
Without the switch, the battery would soon run down. Mechanical switches on your wall allow you to conveniently control your room lighting when you enter a room. Switches on your TV remote can give you control over more complicated tasks: such as flipping the TV channel you are watching, or adjusting the volume from your TV soundbar or bluetooth speakers. The power for
the circuit above comes from the battery. The switch, when closed, will conduct and let the battery connect to the other components in the circuit. In this position the switch makes or closes the circuit. The switch, when opened, will insulate and disconnect the battery from the rest of the circuit. In this position the switch "breaks or opens the circuit". In the torch/lamp circuit above, it is important to match the voltage rating of the lamp with the voltage supplied by the battery. This will prevent it from overloading and getting damaged. Selecting the correct values for many other electronic circuit components is important too and you will find out more about this later on.
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