Answer to Question #51019 in Electric Circuits for Godspower

Question

Two resistances
2Ω
and
3Ω
are in parallel. The combination is in series with
1.5Ω
resistance and a power supply of voltage V. There is a current of 3A through the
2Ω
resistance. What are the values of the current I delivered by, and the voltage V across the power supply?

Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?

In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was
I=kVn
, where k and n are constants which may be obtained from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is

A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal