Components in Series & Parallel CircuitsEdexcel GCSE Physics: Flashcards

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How is an ammeter connected relative to the component it is measuring?

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How is an ammeter connected relative to the component it is measuring?: In series, so the same current flows through both.
How is a voltmeter connected relative to the component it is measuring?: In parallel, to measure the potential difference across it.
How does current vary with potential difference for a fixed resistor at constant temperature?: Current is directly proportional to potential difference — resistance stays constant.
How does the resistance of a filament lamp change as current increases?: It increases, because the filament heats up.
How does current behave for a diode in the forward direction?: Current flows easily — the diode has very low resistance.
How does current behave for a diode in the reverse direction?: Almost no current flows — the diode has very high resistance.
How does the resistance of an LDR change as light intensity increases?: It decreases.
How does the resistance of a (negative temperature coefficient) thermistor change as temperature increases?: It decreases.
Name two circuit components tested in the Core Practical on I–V characteristics.: A resistor and a filament lamp.
What does a graph of current against potential difference for a fixed resistor look like?: A straight line through the origin, showing direct proportionality.
Why does a filament lamp's I–V graph curve and flatten at higher currents?: As current increases, the filament heats up, increasing its resistance, so current increases less for each extra volt.
State one everyday application that relies on an LDR's light-dependent resistance.: Automatic street lighting or light sensors that switch on in the dark (resistance rises as light falls, triggering the circuit).