LDRs (light dependent resistors) are semiconductor devices. From the Institute of Physics, in this learning episode students investigate the resistance of an LDR at different light intensities. This can be used as a basis to explain how photons liberate free electrons...

In this learning episode, from the Institute of Physics, students see how and why the resistance of a wire depends on the wire’s dimensions. They learn the definition of resistivity and use it in calculations.

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This series of activities, from the Institute of Physics, explores ideas about electricity applied to circuits that have real applications. Each learning episode is self-contained and tackles a particular topic. In this series the topics are:

Episode 114: Components in...

Produced by the Institute of Physics, this learning episode helps students to investigate the effective resistance of circuits with components in series and parallel. The activities include demonstrations, worked examples and student investigations.

In these activities, from the Institute of Physics, the concept of electrical power is explored. Students find that the energy transferred by an electrical component depends on the potential difference, current and the time for which it operates.

Part of a suite of activities produced by the Institute of Physics, this resource helps students develop their competence in using equations relating power and energy, in an electrical context.

The activities in this...

From the Institute of Physics, this learning episode links Kirchhoff’s circuit laws to the conservation of charge and energy. Students can verify the laws experimentally and use them to solve simple circuit problems.

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Produced by the Institute of Physics, this student experiment introduces the use of a potential divider as a source of variable potential difference. Students also learn to use potential dividers to detect temperature or light levels.

This series of activities, from the Institute of Physics, explores electromotive force (emf), internal resistance, voltage, current and charge. They link with a general discussion of energy transfers within electric circuits, involving energy transfer from a chemical battery to electrical work. Each learning...

Produced by the Institute of Physics, this learning episode can be used to revises the idea of electromotive force (emf), introduce internal resistance and the consequent energy losses.

The activities include:
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In this learning episode, from the Institute of Physics, students derive the equation relating electromotive force (emf), terminal potential difference, current and internal resistance. They then tackle questions about the internal resistance of a power supply.

This demonstration or student practical activity, from the Institute of Physics, helps students learn to use an oscilloscope to measure voltages. It helps students to understand the use of a cathode ray oscilloscope by showing:
• how the oscilloscope plots a graph...

Produced by the Institute of Physics, this learning episode helps students to distinguish alternating from direct currents before revising why alternating current (ac) is so important.

The range of activities include...

In this series of learning episodes from the Institute of Physics, students undertake a range of practical investigations into capacitors and their properties. Students apply exponential equations, which can help to reinforce other areas such as radioactive decay.

The topics covered are:

Episode 125...