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Y8 Electricity 01 electrical energy & voltage

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Y8 Electricity 01 electrical energy & voltage

  1. 1. Electrical Energy & Voltage <ul><li>Learning Objectives : </li></ul><ul><li>To describe how energy can be stored e.g. electrical cells. </li></ul><ul><li>To describe how energy is transferred e.g. simple circuits. </li></ul><ul><li>Starter : </li></ul><ul><li>What does a battery do? </li></ul><ul><li>Explain with reasons. </li></ul>
  2. 2. What is a battery? A battery consists of two or more cells that are joined together. The potential difference across a battery is the sum of the potential differences across the cells. A 12 V car battery contains six 2 V cells inside its case. Circuit symbol for a battery V
  3. 3. How can battery voltage be increased? If two or more cells are connected in series, the total voltage across the battery can be found by adding up the cell voltages. 3 V 4.5 V Using more cells in a battery increases the voltage. So, if 2 cells with a voltage of 1.5 V are connected together, the voltage across the battery is 3 V. When three cells of 1.5 V are connected, what is the voltage across the battery? V 1.5 V V V
  4. 4. Videos <ul><li>The power of batteries in a circuit . </li></ul><ul><li>Current and energy in a circuit . </li></ul>
  5. 5. Circuit symbols
  6. 6. Circuit components
  7. 7. What is a short circuit? Current will always pass along the path of least resistance. The resistance of the wires in a circuit is low compared to the resistance of components, such as bulbs. The current can only pass through the bulb. These circuits both contain a short circuit, so the bulb will not be lit up. If current can flow along a path without passing through the components this part of the circuit is called a short circuit .
  8. 8. Voltage Voltage is a measure of the difference in electrical energy between two parts of a circuit. The bigger the difference in energy, the bigger the voltage. Voltage is measured in volts .
  9. 9. Voltage <ul><li>The symbol for volts is V . For example, 230V is a bigger voltage than 12V. Voltage is measured using a voltmeter. Some types of voltmeter have a pointer on a dial, but most have a digital readout. To measure the voltage across a component in a circuit, you must connect the voltmeter in parallel with it. </li></ul>
  10. 10. Electricity <ul><li>Electricity summary </li></ul>
  11. 11. Electrical Energy & Voltage <ul><li>Learning Objectives : </li></ul><ul><li>To describe how energy can be stored e.g. electrical cells. </li></ul><ul><li>To describe how energy is transferred e.g. simple circuits. </li></ul>

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