Measuring Current Learning Objective: Use an ammeter with care 21/11/2018 Measuring Current Learning Objective: Use an ammeter with care Measure and record current in simple series circuits A Starter: Drawing Circuit Diagrams

Starter: Draw Circuit Diagrams for the following 21/11/2018 Starter: Draw Circuit Diagrams for the following A B D C

21/11/2018 Series Circuit This is a simple series circuit. In a simple series circuit, everything is connected in one loop across the terminals of the battery. There are no places (junctions) where the current can split lamps

21/11/2018 Series The current goes in one loop only

Circuits digrams 1) A cell, a bulb and a switch “in series” 21/11/2018 1) A cell, a bulb and a switch “in series” 2) A battery of cells, a switch and two bulbs in series

Measuring electric current 21/11/2018 Measuring electric current We can measure the amount of electric current flowing through a circuit using a device called an “ammeter”. A

“THIS IS THE SAME CIRCUIT” Measuring Current 21/11/2018 A Method “THIS IS THE SAME CIRCUIT” Build the first circuit. Write down the reading on the ammeter. Now build the 2nd circuit. Write down the reading on the ammeter. Build the 3rd circuit and write down the ammeter reading. A A A

Current in a series circuit 21/11/2018 Current in a series circuit 2 amps here 2 amps here A A A 2 amps here The current in a series circuit is THE SAME at any point

21/11/2018 Conclusion The reading on the _____________ shows the amount of _____________ flowing around the _____________ . The current is the _____________ everywhere in the _____________ . The current is not _____________ by the bulbs. Key words: ammeter circuit current same used up