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Understanding Voltmeters and Ammeters in Electric Circuits

Learn how to correctly use voltmeters and ammeters in circuits, understand the effects of series connections, and choose the best type of cable for different applications. Experiment with wires, bulbs, and resistors to explore electrical principles.

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Understanding Voltmeters and Ammeters in Electric Circuits

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  1. Using Voltmeters and Ammeters www.assignmentpoint.com

  2. V A Using Voltmeters and Ammeters Voltmeter – connected in parallel Ammeter connected in series www.assignmentpoint.com

  3. V Correctly Wired? No! The voltmeter has been connected in series – it should be parallel www.assignmentpoint.com

  4. A Correctly Wired? No the Ammeter has been connected in parallel – it should have been series www.assignmentpoint.com

  5. A Correctly Wired? Yes! This Ammeter has been connected correctly in series www.assignmentpoint.com

  6. A Correctly Wired? Yes! This Ammeter has been connected correctly in series www.assignmentpoint.com

  7. V Correctly Wired? Yes! The Voltmeter has been connected correctly in parallel www.assignmentpoint.com

  8. A Correctly Wired? Yes! The Ammeter has been connected correctly in series www.assignmentpoint.com

  9. Effects of Series? As more bulbs are added in series the bulbs grow dimmer www.assignmentpoint.com

  10. Circuit Diagram Iron Plastic Brass Rubber Copper Perspex Steel Glass Graphite Wood www.assignmentpoint.com

  11. Electric fire Glows red hot Conducts doesn’t get hot Conducting wires Safety fuse Heats up and melts www.assignmentpoint.com

  12. dim 1.5 V brighter 6 V 12 V bright When the voltage increases the current increases www.assignmentpoint.com

  13. 5. Write down your ideas. • The more batteries the brighter the bulb • This holds true as long as the batteries face the same way • If batteries are reversed they cancel each other out Elephant handout www.assignmentpoint.com

  14. Text Animation 1 www.assignmentpoint.com

  15. Title: Aim: Method: Choosing the best type of cable To compare copper/nichrome, thick/thin, long/short wires and find the best Test thick and thin wires in a circuit and measure how it affects the current using an ammeter. Then test copper/nichrome and long/short wires. www.assignmentpoint.com

  16. A Diagram: Results: A bulb may be used instead of an ammeter www.assignmentpoint.com

  17. Conclusion: • Short wires are better than long wires. • Copper wires are better than nichrome wires. • Thick wires are better than thin wires. www.assignmentpoint.com

  18. Copper has a resistance than nichrome Thin wires have resistance than thick ones Longer wires have resistance than short ones lower higher higher www.assignmentpoint.com

  19. The variable resistor 4. Write down what you found out. The longer the wire (coil) the dimmer the bulb, the shorter the wire the brighter the bulb. www.assignmentpoint.com

  20. The variable resistor Write down what you found out. The longer the wire (coil) the smaller the current and the dimmer the bulb. The longer wire has a higher resistance. www.assignmentpoint.com

  21. A long thin nichrome wire has a higher resistance because • a) Thick copper wires are good for carrying current because • b) Long thin coils of nichrome are used in electric fires because thick has a lower resistance, as does copper and short wires. copper is a good conductor and thick wires have low resistance nichrome has a high resistance causing it to heat up without melting www.assignmentpoint.com

  22. 3. A variable resistor is used to 4. When the volume on a radio is turned Down 5. Cookers need thick cabling increase and decrease the current by changing the length of a resistance wire the resistance wire is lengthened, causing a reduction in the current. because they use much more current than lamps www.assignmentpoint.com

  23. The purpose of a fuse is to protect you from a short circuit - safety Not to make the device work www.assignmentpoint.com

  24. V A Circuit Symbols(components used in slides) You can find more downloads and help at www.lab6.co.uk www.assignmentpoint.com

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