Electric Circuits Answers

A given wire has a resistance of 32 ohms. If its length is 872 m., how much length must be

cut-off from the wire in order to reduce its resistance to 13.4 ohms?

 The capacitors have values C1 = 2.5 μF, C2 = 4.0 μF, C3 = 6.0 μF and C4 = 8.0 μF. Assume that the capacitors are connected in series. Find the equivalent capacitance of the circuit.

 What is the potential energy of a similarly charged fragment at this distance?

In nuclear fission, a nucleus splits roughly in half. What is the potential 5.00×10 –12 m from a fragment that has 42 protons in it?

Determine the charge transferred when a current of 5mA flow for 10 minutes

A d, c motor consumes 47.25MJ when connected to a 250 V supply for 1 hour 45 minutes. Determine the power rating of the motor and the current taken from the supply

The capacitors have values c1

Calculate the length of the resistor of a circular wire used in a heater element connected to a 240V supply and the heater consumes 8 joules of energy in 0,25 seconds. The resistor element is made of aluminium and it has a uniform cross-sectional area with a diameter of 0,00016 inches.

Hints: 1inch = 25,4 mm, resistivity of aluminium = 2,825 x 10- 6 cm

C1 =3.0 uF and a C2 = 5.0 uF capacitors are connected in series with a 12-V battery. Find the equivalent capacitance

Two protons in a molecule are separated by a distance of 3.6 x 10^-10 m. Find the electrostatic force exerted by one proton on the other.