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Electrical quantities
Identify that there are two types of electric charges: positive and negative.
24
Objectives
240
Flashcards
168
Questions
90 min
Study time
CambridgeIGCSECombined ScienceElectricity
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24 objective pages available
Electrical quantities outcomes24 objectives
- Identify that there are two types of electric charges: positive and negative.
- Recognize that like charges repel each other while opposite charges attract each other.
- Differentiate between electrical conductors and insulators, providing examples of each.
- Identify that electric charge is quantified in coulombs.
- Understand that electric current is associated with the movement of charge.
- Recognize that in metals, electric current is due to the flow of electrons.
- Explain how ammeters (both analogue and digital) are used across various ranges.
- Differentiate between direct current (d.c.) and alternating current (a.c.).
- Describe how the voltage of a source causes current to flow in a circuit.
- Understand that in a series circuit, the voltage from the source is distributed among the components.
- Explain how voltmeters (both analogue and digital) are utilized across different ranges.
- Recall and apply the formula for resistance, expressed as V = IR.
- Define electric current as the charge that passes a point per unit time and use the equation Q = It.
- Describe how electrical conduction in metals occurs through the movement of delocalized electrons.
- State that conventional current flows from positive to negative, while electron flow is from negative to positive.
- Define electromotive force (e.m.f.) as the work done by a source to move a unit charge around a complete circuit.
- Know that electromotive force (e.m.f.) is measured in volts (V).
- Define potential difference (p.d.) as the work done by a unit charge moving between two points in a circuit.
- Know that potential difference (p.d.) is also measured in volts (V).
- Recall and apply the relationships for a metallic conductor: (a) resistance is directly proportional to length and (b) resistance is inversely proportional to cross-sectional area.
- Understand that electric circuits transfer energy from a source, like a battery or mains supply, to the components and then to the surroundings.
- Recall and use the equation for electrical power, expressed as P = VI.
- Recall and use the equation for electrical energy, given as E = VIt.
- Define the kilowatt-hour (kWh) and calculate the cost of using electrical appliances based on this energy unit.
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