Electric Circuits

Title: Current in Parallel WALT: Set up and measure the current in a parallel circuit I must be able to set up a parallel circuit I should be able to state how the current changes in a parallel circuit

Starter – Hot seat Volunteer please!! The volunteer can only answer yes or no. The volunteer will be a piece of science equipment and you must guess what he or she is. Ask our volunteer questions by raising your hand. RULE: You must not guess the answer until at least 3 questions have been asked Ammeter Lamp

The other day we learnt.... Today, we will learn What current is ... How to measure current..... How in a series circuit, current ..... Today, we will learn How current can vary within a circuit How making changes to the number of cells or bulbs influences bulb brightness

A series circuit How would we represent this in a circuit diagram? Come and draw it...

A parallel circuit A parallel circuit has more than one path for the current to flow around Demo parallel Talk about advantages of parallel circuits – using Christmas tree example of series circuit and chandalier for parallel

You will test the current in 3 different places 1. 2. 3. When you draw this, just draw one diagram and label the ammeter A1, A2, A3

Measuring current in a parallel circuit Look at page J3a in the workbooks Method Set up a circuit with 2 bulbs in parallel Using an ammeter, measure the current in 3 different positions Copy diagram Record results in a table. Column 1 = Position of ammeter (Position 1, position 2, position 3); column 2 = Current (A) Write a conclusion Copy diagram onto board but instead of copying out all three. Use letter A with a number 1, 2 or 3 after to denote the position Work in threes

Plenary You have 2 minutes to note down a 30 second ‘presentation’ to the others about what you have learnt today. Make notes in rough about what you are going to say.