Draw a circuit diagram for a circuit in which two resistors A and B are connected in series with a battery and a voltmeter is connected to measure the potential difference across the resistor A.

In the above circuit diagram there are two resistors A and B which are connected in series. To resistor A voltmeter is connected in parallel. A battery and a key is also connected. When key is switched on current will flow across resistors. If key is off no current flows across both the resistors.