Question

you are given three resistors of 10 ohm 10 ohm and 20 Ohm a battery of EMF 2.5 volt one key an ammeter a voltmeter. draw a circuit diagram showing the correct connection of all given components such that voltmeter connected across the ends of 20 ohm resistor give the reading of 2.0 volt.

Answer 1

In the below picture u find your answer

Answer 2

The circuit diagram showing the correct connection of all given components is attached below.

• The ammeter is always connected in series with the circuit.
• The voltmeter should be connected in parallel with the 20Ω resistor.

• The explanation for the given combination of resistors:

• From the given circuit arrangement, the equivalent resistance of the circuit = 20 + (10X10/10+10)

       = 25Ω

• The net current in the circuit using the Ohm's Law = V/R = 2.5/25 = 0.1A.
• The reading in the voltmeter = The voltage across the 20Ω resistor = IR = 0.1 X 20 = 2V.