# Practical electrical and electronic circuits

## Series circuits

This is a series circuit.

In a circuit there is only one path for the and the current is the same at all points.

## Current in series circuits

We measure current using an .

An ammeter must be connected in series with other components in a circuit. This means we need to break into the circuit when we add an ammeter.

The current in a series is the same at all places in the circuit.

Circuit with a cell, closed switch and two lamps connected in a series

We can write this current relationship as:

${I_s} = {I_1} = {I_2} = {I_3} = ...$

Question

Look at the series circuit below - what is the reading at?

Position one: more than 0.1A, 0.1A or less than 0.1A

Position two: more than 0.1A, 0.1A or less than 0.1A

Position three: more than 0.1A, 0.1A or less than 0.1A

Position 1 = 0.1A

Position 2 = 0.1A

Position 3 = 0.1A

Remember that the charge moves all the way around the circuit.