Electrical Principles: More Practice

Ohm's law, series and parallel circuit behaviour, and how wiring choices affect wasted energy.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

A 6 Ω resistor is connected to a 12 V battery. Using Ohm's law, what current flows through it, in amps?
A circuit has a voltage of 120 V and a current of 4 A. Find its resistance, in ohms.
In a series circuit, what happens to the current at every point around the loop?
In a parallel circuit, what stays the same across every branch?
An appliance uses 1500 W of power for 2 hours. How much energy does it use, in kilowatt hours?
Use the table below, showing the current measured through three resistors wired in series. Which reading must be wrong if this really is a series circuit?
Two resistors, 4 Ω and 8 Ω, are connected in series. Find the total resistance of the circuit, in ohms.
Which change would reduce the energy wasted as heat in a circuit's wiring?