Electric Circuits Answers

A bar magnet is positioned near a coil of wire, as shown to the right. What is the direction of the
magnetic field induced in the coil when the magnet is moved a) to the left, and b) to the right?

A business uses two 3kW fires an average of 20 hours each per week and six 150W lights for 30hours each per week. If the cost of electricity is 14.25p per unit, determine the weekly cost of electricity to the business.

Determine the power dissipated when a current of 10Ma flows through an appliance having a resistance of 8kΩ

A d.c electric motor consumes 36 MJ when connected to a 250V supply for 1 hour. Find the power rating of the motor and the current taken from the supply.

If you plug a toaster into an outlet that provides an electrical potential difference of 120 V and this toaster does 64.8 J of work in 1 minute toasting your bread, how much current is flowing through the toaster?

Two 6µF capacitance are connected in series with one having a capacitance of 12µF.Find the total equivalent circuit capacitance. What capacitance must be added in series to obtain a capacitance of 1.2µF.

A 12µF capacitor is required to store 4J of energy. Find the p.d to which the capacitor must be charged.

A 12µF capacitor is required to store 4J of energy. Find the p.d to which the capacitor must be charged.

Explain the phenomenon of avalanching in a zener diode

A battery of e.m.f 5.0 V is connected to a resistor of 50 Ω. What is meant by the e.m.f of 5V?