Current Electri...

Two wires of the metal have the same length but their cross-sections are in the ratio 3:1 They are joined in series: The resistance of the thicker wire is 10 Ω. The total tesistance of the combination will be

A wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the resistance of the wire were 10Ω, its new resistance would be

Which of the following has negative temperature coefficient of resistance?

A parallel combination of three resistors takes a current of 7.5 A form a 30 V supply, It the two resistors are 10 Ω and 12 Ω find which is the third one?

A potentiometer wire has length 10 m and resitance 20Ω. A 2.5V battery of negligble internal resistance is connected across the wire with an 80Ω series resistance. The potential gradient on the wire will be:

The drift velocity of free electrons through a conducting wire of radius r, carrying current I, is if the same current is passed through a conductor of radius 2r what will be the drift velocity?

A carbon resistor has a set of coaxial coloured rings in the order brown, violet brown and silver. The value of resistance (in ohms) is

A cross a wire of length l and thickness d, a p.d of V is applied. If the p.d is doubled the dirft velocity becomes....

The masses of three wires of copper are in the ratio of 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistance is:

Two resistors when connected in parallel have an equivalent of 2Ω and when in series of 9Ω The values of the two resistors are.