Current Electricity

Related Questions

• Four identical cells each having an electromotive force (e.m.f.) of 12V, are connected in parallel. The resultant electromotive force (e.m.f.)of the combination is

  ---

• The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of $3 \Omega$ resistance. If the total number of cells used are 24 and internal resistance of each cell is $0.5 \Omega$ then

  ---

• The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of $5\,\Omega $ the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell

  ---

• The heat developed in an electric wire of resistance R by a current I for a time t is

  ---

• Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be

  ---