What is electrical resistivity ? In a series electrical circuit comprising a resistor made up of a matallic wire, the ammeter reads `5 A`. The reading of the ammeter decreases to half when the length of the wire is doubled. Why ?

What is electrical resistivity? In a series electrical circuit comprising of a resistor having a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?

What is electrical resistivity ? Derive its SI unit, In a series electrical comprising a resistor made up of metallic wire, the ammeter reads , 100 mA. If the length of the wire is doubled, how will the current in the circuit change ? Justify your answer.

What is electrical resistivity ? Derive its SI unit, In a series electrical comprising a resistor made up of metallic wire, the ammeter reads , 100 mA. If the length of the wire is doubled, how will the current in the circuit change ? Justify your answer.

In the circuit given below the ammeter reading is zero. What is the value of the resistance R ?

In the circuit shown below, the ammeter A reads 5 A and the voltmeter V reads 20 V The correct value of resistance R is

In the adjacent circuit the ammeter reads 5.0 A and voltmeter reads 20V. The value of resistance R is

To measure electric current, an ammeter is connected in series With a resistor, why?

In the given figure when the key is open the ammeter reading is 5 amp. What will be the ammeter reading when the key is closed