Current Electricity

Related Questions

• The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is

  ---

• The material of wire of potentiometer is

  ---

• A heating coil can heat the water of a vessel from $20^\circ C$ to $60^\circ C$ in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)

  ---

• The maximum power drawn out of the cell from a source is given by (where r is internal resistance)

  ---

• Three resistances of magnitude 2, 3 and 5 ohm are connected in parallel to a battery of 10 volts and of negligible resistance. The potential difference across $3\,\Omega$ resistance will be

  ---