state that current is a rate of flow of charge and that it is measured in amperes
distinguish between conventional current and electron flow
recall and apply the relationship charge = current × time to new situations or to solve related problems
define electromotive force (e.m.f.) as the work done by a source in driving unit charge around a complete circuit
calculate the total e.m.f. where several sources are arranged in series
state that the e.m.f. of a source and the potential difference (p.d.) across a circuit component are measured in volts
define the p.d. across a component in a circuit as the work done to drive unit charge through the component
state the definition that resistance = p.d. / current
apply the relationship R = V/I to new situations or to solve related problems
describe an experiment to determine the resistance of a metallic conductor using a voltmeter and an ammeter, and make the necessary calculations
recall and apply the formulae for the effective resistance of a number of resistors in series and in parallel to new situations or to solve related problems
recall and apply the relationship of the proportionality between resistance and the length and cross-sectional area of a wire to new situations or to solve related problems
state Ohm’s Law
describe the effect of temperature increase on the resistance of a metallic conductor
sketch and interpret the I/V characteristic graphs for a metallic conductor at constant temperature, for a filament lamp and for a semiconductor diode
LESSON VIDEOS
17.1 Current
17.2 Electromotive Force (emf) and Potential Difference
17.3a Resistance
17.3b Ohm's Law
17.4 Resistivity
I DO, YOU DO, WE DO! LET'S PRACTICE!
WS 17.1 Current, EMF and Potential Difference.pdf
WS 17.1
WS 17.2 Resistance and Resistivity.pdf
WS 17.2
APPLETS TO TRY!
Understand how the variable resistor works by sliding the contact!