K223 / K224 / 2027

Chapter 10

Electric charge and current of electricity

Current describes charge passing a point; voltage describes energy transferred per charge.

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Choose a topic

  1. Electric charge and interactions

    Distinguish positive, negative and neutral objects, and interpret attraction and repulsion.

  2. Current, charge and electron flow

    Use charge per second, distinguish flow directions and measure current in the chosen branch.

  3. E.m.f. and potential difference

    Distinguish source e.m.f. from component potential difference and connect a voltmeter across the intended points.

  4. Resistance and wire dimensions

    Match voltage and current to the same component, then compare wire length and cross-sectional area.