1. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. We can use a central heating system as a model for an electrical circuit.

2. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. These statements describe what the central heating system does. What is each part of the central heating system modelling in the electrical circuit? Central heating system The boiler transfers heat energy to the water. Electrical circuit The cell transfers energy to the moving electrons.

3. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. These statements describe what the central heating system does. What is each part of the central heating system modelling in the electrical circuit? Central heating system The pump pushes water around the pipes. Electrical circuit The cell pushes electrons around the wires.

4. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. These statements describe what the central heating system does. What is each part of the central heating system modelling in the electrical circuit? Central heating system The water does not get used up – it just goes round and round the pipes. Electrical circuit The electrons do not get used up – they just go round and round the wires.

5. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. These statements describe what the central heating system does. What is each part of the central heating system modelling in the electrical circuit? Central heating system The radiator transfers heat energy from the water to the room. Electrical circuit The light bulb transfers electrical energy to heat and light energy.

6. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. These statements describe what the central heating system does. What is each part of the central heating system modelling in the electrical circuit? Central heating system Helps to keep the house warm. Electrical circuit Produces light.

7. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. An engineer wants to find out how much energy is being transferred by a radiator, so she measures the temperature of the water as it goes into a radiator and again when it comes out. What measurement does this represent in an electrical circuit? Ausing an ammeter to measure potential difference Busing a voltmeter to measure potential difference Cusing an ammeter to measure the size of the current Dusing a voltmeter to measure the size of the current

8. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. Measuring the temperature of the water can help the engineer to find out how much energy is being transferred in the hot water. The difference in temperature each side of the radiator is a model for measuring the energy carried by the electrons each side of a component. This is the potential difference, and is measured using a voltmeter.

9. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. Next she measures the volume of water flowing through the radiator each second. What measurement does this represent in an electrical circuit? Ausing an ammeter to measure potential difference Busing a voltmeter to measure potential difference Cusing an ammeter to measure the size of the current Dusing a voltmeter to measure the size of the current

10. P2.4 Central heating model © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. Measuring the volume of water flowing each second is a model for measuring the number of electrons flowing in a circuit. The number of electrons flowing is the current, and is measured using an ammeter.