Cambridge IGCSE Physics4.2 Electrical quantities Worksheet
23 questions · 50 marks · Word
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What objectives does this worksheet meet?
Core
- I can state that there are positive charges and negative charges.
- I can explain that charging solids by friction involves the transfer of negative charge (electrons) only.
- I know that electric current is related to the flow of charge.
- I can describe how ammeters (analogue and digital) with different ranges are used.
- I can define electromotive force (e.m.f.) as the electrical work done by a source in moving a unit charge around a complete circuit.
- I can define potential difference (p.d.) as the work done by a unit charge passing through a component.
- I can describe how voltmeters (analogue and digital) with different ranges are used.
- I can recall and use the equation for resistance, R = V/I.
- I understand that electric circuits transfer energy from a source of electrical energy, such as an electrical cell or the mains supply, to the circuit components and then into the surroundings.
- I can recall and use the equation for electrical energy, E = IVt.
Extended
- I can state that the direction of an electric field at a point is the direction of the force on a positive charge placed at that point.
- I can define electric current as the charge passing a point per unit time, and I can recall and use the equation I = Q/t.
- I can state that conventional current goes from positive to negative, and that free electrons flow from negative to positive.
- I can recall and use the equation for e.m.f., E = W/Q.
- I can recall and use the equation for p.d., V = W/Q.
- I can sketch and explain the current–voltage graphs for a resistor of constant resistance, a filament lamp and a diode.