Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads "red," "violet" and "yellow"?

Why

The first two colours, red and violet, give the digits 2 and 7, while the third colour, yellow, acts as a multiplier meaning you add four zeros. The full explanation — and one for every question — is in Pro.

Practise this section

Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.

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