[" 8.What is electrical resistivity? In a series electrical circuit comprising a resistor made "],[" up of 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? (3) "]

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.

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

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

A hot wire ammeter reads 10 A in an ac circuit. The peak value of current is

In the circuit shown in figure-3.388, each ammeter has coil resistance 2 Omega , find reading of the two ammeters.

X, Y and Z are ammeters and Y reads 0.5 A. (i) What are the readings in ammeters X and Z ? (ii) What is the total resistance of the circuit ?