d.c. theory - (science -campus)

1.01 Introduction to D.C. Theory

The diagram below shows a simple electrical circuit (cct.). It consists of a battery, some connecting wires, a switch and a bulb. We can actualy learn a great deal about electricity just by investigating how this simple circuit works.

simple electrical circuit

After completing this section you should be able to:

Explain what electrical current is
Explain what is meant by the terms "charge" and "charged particle"
Calculate values for current (I), quantity of charge (Q) or time (t) using the equation I=Q/t
Describe how the electrical current in a circuit is related to voltage applied to the circuit and it's resistance.
Calculate values for current (I), voltage (V) or resistance (R) using Ohm's law

In the later sections you will learn more about voltage and resistance