Electrical circuits

Resistors are found in all electrical circuits and are used to reduce the flow of current, to adjust signal levels and to divide voltages. The behaviour of a resistor in an electrical circuit is described by Ohm's law: V (voltage or potential difference; volts) = I (current; ampere) x R (resistance; ohm). Use this application to explore how resistors in series alter the current flowing in a simple electrical circuit.

Use this application to explore how resistors in parallel alter the current flowing in a simple electrical circuit.

All wires contribute resistance to an electrical circuit, for most this is so small that it can be ignored but some wires, such as those made from nichrome (an alloy of nickel, chromium and iron) have a high resistance. Use this application to explore how the length and diameter of a nichrome wire changes its resistance.

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