Judge the assertion and the reason

Exercise and reference answers

Questions

1. Reason

   The power factor there is zero, so no power is dissipated even though a current flows.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   A purely reactive ac circuit dissipates no power.

2. Reason

   A well designed transformer can be more than ninety-five per cent efficient.

   Verdict

   Both are true; the reason does not explain the assertion.

   Assertion

   Mains voltage is quoted as 220 volts.

3. Reason

   Alternating current travels along a wire faster than direct current.

   Verdict

   The assertion is true and the reason is false.

   Assertion

   Alternating voltage is preferred for power distribution.

4. Reason

   In a capacitor the current leads the voltage by a quarter cycle.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   In an inductor the current leads the voltage.

Instructions

Read both statements, then pick the verdict that fits.

Explanation