Question

An electric bulb works on $230V$ line and draws $0.1A$ current. The resistance of the filament is:

• A. $230\Omega$
• B. $2300\Omega$
• C. $23\Omega$
• D. $2.3\Omega$

Answer 1

The correct option is B $2300\Omega$

Voltage, $V=230V$

Current, $I=0.1A$

According to Ohm's law,

$V=IR$
$\Rightarrow R=\frac{V}{I}$

$=\frac{230}{0.1}$
$\Rightarrow R=2300\Omega$