Electronics revision Electronics Revision Part 1

When certain insulating materials are rubbed against each other they become electrically charged. Negatively charged _______ are rubbed off one material onto the other. Electrons

The material that gains electrons becomes _______ charged. negatively

The material that loses electrons is left with a _______ charge. positive

When two electrically charged objects are brought together they feel a ____ from each other. force

Two objects that have different types of charge _______. attract

Two objects that carry the same type of charge ____. repel

The rate of flow of electrical charge is called the _____. current

If the potential difference becomes high enough a ____ may jump across the gap between the object and any earthed conductor near it. spark

Electrostatic charges can be useful, for example in _________ photocopiers

Switch

Bulb

fuse

cell

Voltmeter

battery

ammeter

resistor

Thermistor

Variable resistor

L.D.R.

potential difference current resistance (volt, V) (ampere, A)(ohm, Ω)

The resistance of a filament lamp ________ as the temperature of the filament increases. increases

The current through a diode flows in ___ direction. one

5How does the voltage vary around a series circuit? 4Why does the current not change around a series circuit? 3How does the current vary around a parallel circuit? What happens at each T-junction? 2A simple parallel circuit – battery and two bulbs – again with symbols. 1A simple series circuit – battery and two bulbs – using symbols and labelled.