Electrical Quantities Continued
Übersicht
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.
Ziele
- [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
Lektionshinweis
Verfügbar in der Green Bridge App
Laden Sie die Green Bridge CBT App auf Ihr Telefon oder Ihren Computer herunter, um auf vollständige Lernnotizen, Übungsfragen und mehr zuzugreifen.
Unterrichtsbewertung
Herzlichen Glückwunsch zum Abschluss der Lektion über Electrical Quantities Continued. Jetzt, da Sie die wichtigsten Konzepte und Ideen erkundet haben,
Sie werden auf eine Mischung verschiedener Fragetypen stoßen, darunter Multiple-Choice-Fragen, Kurzantwortfragen und Aufsatzfragen. Jede Frage ist sorgfältig ausgearbeitet, um verschiedene Aspekte Ihres Wissens und Ihrer kritischen Denkfähigkeiten zu bewerten.
Nutzen Sie diesen Bewertungsteil als Gelegenheit, Ihr Verständnis des Themas zu festigen und Bereiche zu identifizieren, in denen Sie möglicherweise zusätzlichen Lernbedarf haben.
- 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
Verfügbar in der Green Bridge App
Laden Sie die Green Bridge CBT App auf Ihr Telefon oder Ihren Computer herunter, um auf vollständige Lernnotizen, Übungsfragen und mehr zuzugreifen.
Verfügbar in der Green Bridge App
Laden Sie die Green Bridge CBT App auf Ihr Telefon oder Ihren Computer herunter, um auf vollständige Lernnotizen, Übungsfragen und mehr zuzugreifen.
Empfohlene Bücher
Übungsklausuren üben
Möchten Sie Übungsklausuren zu Electrical Quantities Continued üben? Laden Sie die Green Bridge CBT App herunter, um Übungsklausuren und vollständige Prüfungssimulationen zu diesem Thema zu erhalten.
Lade die App im Google Playstore herunter.
Alles, was du brauchst, um in JAMB, WAEC & NECO zu glänzen.
