Chapter 14
Current of electricity
Current describes charge passing a point; voltage describes energy transferred per charge.
Spaced review
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Current, charge and electron flow
Use charge per second, distinguish flow directions and measure current in the chosen branch.
E.m.f. and potential difference
Use energy per charge, connect a voltmeter and combine correctly oriented series sources.
Resistance and wire dimensions
Match voltage and current to the same component, then compare wire length and cross-sectional area.
Temperature and I-V characteristics
Explain metallic resistance changes and interpret wire, lamp and diode graphs.