Electrical Quantities (continued 1)
Overzicht
Every time you switch on a light, charge is pushed around a circuit by a source, gives up energy in the bulb, and returns for more. The push is the electromotive force, the energy given up per coulomb is the potential difference, and the opposition to the flow is the resistance. Master these three and you can analyse and cost almost any circuit.
In this topic you will define e.m.f. and potential difference, use voltmeters, measure and calculate resistance, and link power and energy to current and voltage. You will sketch the current-voltage graphs of a resistor, a lamp and a diode, and learn to work out the cost of running appliances in kilowatt-hours.
Doelstellingen
- [Core] Know that electric current is related to the flow of charge
- [Core] Know that electric current in metals is related to the flow of electrons
- [Core] Describe the use of ammeters (analogue and digital) with different ranges
- [Core] Know the difference between direct current (d.c.) and alternating current (a.c.)
- [Core] Describe the voltage of the source as the cause of current in the circuit
- [Core] Know that the voltage of the source is shared between the components in a series circuit
- [Core] Describe the use of voltmeters (analogue and digital) with different ranges
- [Core] Recall and use the equation for resistance V R = I
- [Supplement] Define electric current as the charge passing a point per unit time; recall and use the equation Q I = t
- [Supplement] Describe electrical conduction in metals in terms of the movement of delocalised (mobile) electrons
- [Supplement] State that conventional current is from positive to negative and that the flow of electrons is from negative to positive
- [Supplement] Define electromotive force (e.m.f.) as the electrical work done by a source in moving a unit charge around a complete circuit
- [Supplement] Know that e.m.f. is measured in volts (V)
- [Supplement] Define potential difference (p.d.) as the work done by a unit charge passing between two points in a circuit
- [Supplement] Know that the p.d. between two points is measured in volts (V)
- [Supplement] Recall and use the following relationship for a metallic electrical conductor: (a) resistance is directly proportional to length (b) resistance is inversely proportional to cross-sectional area
Audioles
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Electrical Quantities (continued 1). Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
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- The resistance of a component carrying 2 A with 12 V across it is: A. 24 ohm B. 6 ohm C. 0.17 ohm D. 10 ohm Answer: B
- A voltmeter should be connected: A. in series with the component B. in parallel with the component C. before the cell only D. it does not matter Answer: B
- The I-V graph of a resistor of constant resistance is: A. a curve flattening off B. a straight line through the origin C. zero one way only D. a horizontal line Answer: B
- A 60 W lamp runs for 1 hour. The energy used is: A. 60 J B. 0.06 kW h C. 60 kW h D. 3600 kW h Answer: B
- 1 kilowatt-hour is equal to: A. 1000 J B. 3600 J C. 3.6 MJ D. 60 J Answer: C
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Aanbevolen Boeken
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Leerboekparagraaf
Ohm's law
Describe how current is related to charge and time, and distinguish between direct current and alternating current
"Physics: Ohm's law" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/19-1-ohms-law. Access for free at https://openstax.org/books/physics/pages/1-introduction
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Leerboekparagraaf
Series Circuits
Interpret circuit diagrams and diagram basic circuit elements
"Physics: Series Circuits" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/19-2-series-circuits. Access for free at https://openstax.org/books/physics/pages/1-introduction
Gepubliceerd door andere organisaties onder open licenties, vermeld zoals zij vragen. Links openen hun websites.
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