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 actually learn a great deal about electricity just by investigating how this simple circuit works.
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