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Episode 108: Resistance

From the Institute of Physics, this learning episode provides a quantitative definition for resistance (R = V / I) which reinforces the qualitative notion that more resistance means less current. It looks at Ohm’s law, describing that this is not the same thing as the definition of resistance. Activities include...
Publication date:
2000 - 2009

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Episode 109: Electrical Characteristics

Produced by the Institute of Physics, in this practical investigation students measure the current and voltage characteristics for several components and identify ohmic and non-ohmic behaviour. Students determine the V-I characteristics for: • a carbon resistor • semiconductor diode • a filament lamp In...
Publication date:
2000 - 2009

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Episode 121: Electromotive Force and Internal Resistance

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.The activities include:• deriving the equation relating...
Publication date:
2000 - 2009

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Episode 122: Using an Oscilloscope

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 of voltage (y-axis) against time (x-axis)• the effects...
Publication date:
2000 - 2009

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Episode 123: Alternating Current

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:• demonstrating the output of a generator• measuring alternating current with a cathode ray...
Publication date:
2000 - 2009

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Episode 125: Introducing Capacitors

In this learning episode from the Institute of Physics, students are introduced to capacitors. Through practical investigations, students look at their charge and discharge process.The activities include:• demonstration of a 'super capacitor' using large sheets of aluminium foil and polythene• capacitors in everyday...
Publication date:
2000 - 2009

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Episode 126: Capacitance and the Equation C = Q/V

This learning episode, from the Institute of Physics, helps students understand how capacitors charge and the concept of capacitance. Students investigate the relationship between charge and potential difference across a capacitor.Activities include:• charging a capacitor• defining capacitance and the farad• practical...
Publication date:
2000 - 2009

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Episode 127: Capacitors in Series and Parallel

In this learning episode, from the Institute of Physics, students derive formulae for capacitors in series and parallel to reinforce their understanding of circuits involving capacitors.The activities in this learning episode include:• charge, voltage and capacitance• deriving formulae for capacitors in series and...
Publication date:
2000 - 2009

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Episode 128: Energy Stored by a Capacitor

Produced by the Institute of Physics, this learning episode looks at the energy stored in a capacitor. Students undertake a practical investigation to look at the energy stored and how this varies with potential difference and capacitance.The activities include:• energy transfer - using a capacitor and an electric...
Publication date:
2000 - 2009

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Episode 129: Discharge of a Capacitor

In this learning episode from the Institute of Physics, students investigate and characterise the exponential discharge of a capacitor.Activities include:• looking at exponential discharge• characteristics of exponentials• spreadsheet model of discharge• varying resistance and capacitance• deriving and using...
Publication date:
2000 - 2009

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