recall that current is a rate of flow of charge, that for a charge to flow, a source of potential difference and a closed circuit are needed and that a current has the same value at any point in a single closed loop
recall that current is a rate of flow of charge, that for a charge to flow, a source of potential difference and a closed circuit are needed and that a current has the same value at any point in a single closed loop
recall and use the relationship between quantity of charge, current and time:
charge (C) = current (A) × time (s)
recall that current (I) depends on both resistance (R) and potential difference (V) and the units in which these quantities are measured
a) recall and apply the relationship between I, R, and V, to calculate the currents, potential differences and resistances in d.c. series circuits:
potential difference (V) = current (A) × resistance (Ω)
b) describe an experiment to investigate the resistance of a wire and be able to draw the circuit diagram of the circuit used PAG7
recall that for some components the value of R remains constant (fixed resistors) but that in others it can change as the current changes (e.g. heating elements, lamp filaments)
a) use graphs to explore whether circuit elements are linear or non-linear and relate the curves produced to their function and properties
b) describe experiments to investigate the I-V characteristics of circuit elements. To include: lamps, diodes, LDRs and thermistors. Be able to draw circuit diagrams for the circuits used PAG6
represent circuits with the conventions of positive and negative terminals, and the symbols that represent common circuit elements, filament lamps, diodes, LDRs and thermistors, switches and fixed and variable resistors