Question

A resistor of $10k\Omega$ having tolerance $10$% is connected in series with another resistor of $20k\Omega$ having tolerance $20$%. The tolerance of the combination will be:

• A. $10$%
• B. $13$%
• C. $30$%
• D. $20$%

Answer 1

The correct option is C $30$%

In series effective resistance $=R_S=(10k\Omega \pm 10$%)+$(20k\Omega \pm 20$%)$=(30k\Omega \pm 30$%)
$\therefore$ Tolerance of the combination $=(\pm 30$%)