An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?

Four resistances are connected to a 5V battery of negligible internal resistance as shown what is the potential across \(2\Omega \)?

A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?

The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is ______________.

In an electrical arrangement as shown the equivalent resistance between X and Y will be

A metallic block has no potential difference applied across it, then the mean velocity of free electrons is _____________.

If the specific resistance of a potentiometer wire is 10^-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10^-6 m², then potential gradient will be ________________.

An electron gun in a TV shoots out a beam of electrons. The beam current is 10\(\mu\)A. The charge that strikes the screen in 1 minute is ______________.

Temperature co-effieient of resistance for metals is ______________.

Which of the following material has the highest specific resistance?

The temperature co-efficient of resistance for alloys is _____________.

Which of the following has negative temperature coefficient of resistance?

When 'n' resistors of equal resistance (R) are connected in series and in parallel respectively, then the ratio of their effective resistance is ______________

The electrical resistivity of a thin copper wire and a thick copper wire are respectively \({ P }_{ 1 }\Omega \) m and \({ P }_{ 2 }\Omega \) m Then_____________.

The colour code on a carbon resistor is red - red - black. The resistance of the resistor is ___________.