Before you build a circuit
by Froga
The handful of ideas that make the Electronics bench lab make sense: what voltage, current and resistance actually are, why an LED needs a resistor, and how Ohm's law ties them together. Ten minutes.
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Study material
Voltage is the push behind the current, supplied by a battery or any other source. It does not move by itself and it does no work by itself. It is what makes current flow once a path exists for it to flow around.
In an electrical circuit, voltage is best described as...
multiple choice
the push that moves current around the loop
the amount of current flowing
how much heat a part gives off
the number of parts in the circuit
Think of it as the pressure pushing electricity round, the way a pump pressurises water in a pipe.
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