Thermistors are usually prepared from

On increasing the temperature of a conductor, its resistance increases because

Which of the following is used for the formation of thermistor?

Emf of a cell is 2.2 volt. When resistance R = $5\mathrm{\Omega }5\; \backslash \; \backslash Omega$ is connected in series, potential drop across the cell becomes 1.8 volt. Value of internal resistance of the cell is

A strip of copper, another of germanium are cooled from room temperature to 80 K. The resistance of

The terminal voltage of a cell of emf E on short circuiting will be

If a battery of emf 2 V with internal resistance one ohm is connected to an external circuit of resistance R across it, then the terminal p.d. becomes 1.5 V. The value of R is

A hall is used 5 hours a day for 25 days in a month. It has 6 lamps of 100 W each and 4 fans of 150 W. The total energy consumed for the month is

The internal resistance of a cell of emf 2 V is $0.1\mathrm{\Omega }0.1\; \backslash \; \backslash Omega$. It is connected to a resistance of $3.9\mathrm{\Omega }3.9\; \backslash \; \backslash Omega$. The voltage across the cell will be

The emf of a cell is 12 V. When it sends a current of 1 A through an external resistance, the p.d. across the terminals reduces to 10 V. The internal resistance of the cell is