Lesson: Chapter 19 — Current Electricity

19.6. Resistors 6 of 7 Reset answers

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Question 6

A resistor reads 1000 Ω with a tolerance of ± 10%. What is the range of values it could actually have?

A 890 Ω to 1110 Ω B 100 Ω to 1000 Ω C 990 Ω to 1010 Ω D 900 Ω to 1100 Ω

The right answer is the one marked above.

900 Ω to 1100 Ω. Ten per cent of 1000 is 100, so the value may lie anywhere between 1000 − 100 and 1000 + 100.

Work out the amount of the variation first and then add and subtract it. Trying to do both steps at once is where this goes wrong.

Answer the question to continue.