know the symbols for a bulb switch and battery

Conductors and insulators. Conductors are substances that an **electric charge** can pass through without difficulty. An electric charge cannot pass through an insulator easily. Different types of **atoms** make a substance a conductor or an insulator.

Many circuits have a combination of series and parallel resistors. Generally, the total resistance in a circuit like this is found by reducing the different series and parallel combinations step-by-step to end up with a single equivalent resistance for the circuit. This allows the current to be determined easily.

Ohm's Law is one of the most fundamental of laws for electrical theory. The Ohms Law formula links voltage and current to the properties of the conductor in a circuit.

Electric **current**. A simple electric **circuit**, where **current** is represented by the letter i. The relationship between the voltage (V), resistance (R), and **current** (I) is V=IR; this is known as Ohm's Law. The electrons, the charge carriers in an electrical **circuit**, flow in the opposite direction of the conventional electric **current**.

## Comments

No comments have yet been made