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Unit 5 Electricity
flashcards
29
Science
Not Applicable
11/15/2012

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Cards

Term
Name the two types of charge.
Definition
positive and negative
Term
What effect do 'like' charges have on each other?
Definition
like charges repel each other
Term
What effect do 'opposite' charges have on each other?
Definition
opposite charges attract each other
Term
What is current?
Definition
a flow of electrons
Term
What is the name for any material that allows electricity to pass though it?
Definition
conductor
Term
What is the name for any material that does not allow electricity to pass though it?
Definition
insulator
Term
Name a material that allows electricity to pass though it.
Definition

any metal e.g. copper

and carbon

Term
Name a material that does not allow electricity to pass though it.
Definition
any non metal e.g. plastic, rubber, glass
Term
What is the unit for measuring current?
Definition
amps or amperes
Term
Which direction do electrons flow round a circuit?
Definition
from negative to positive
Term
What equipment is used to measure current?
Definition
an ammeter
Term
How is an ammeter connected in a circuit?
Definition
in series
Term
What is the energy change in a cell?
Definition
chemical -> electrical
Term
What is voltage?
Definition
a measure of the energy given to electrons
Term
What unit is voltage measured in ?
Definition
Volts
Term
What piece of equipment is used to measure voltage?
Definition
voltmeter
Term
How is a voltmeter connected in a circuit?
Definition
in parallel / across components
Term
What is the difference between a series and parallel circuit?
Definition
a series circuit has only ONE path for the current to flow along
Term
What is the rule for current in a series circuit?
Definition
It is the same at all points
Term
What is the rule for voltage in a series circuit?
Definition
the voltage across components adds up to the voltage across the cell
Term
What is the rule for current in a parallel circuit?
Definition
The sum of the currents in the branches is equal to the current through the supply.
Term
What is the rule for voltage in a parallel circuit?
Definition
Voltages across components in parallel are equal.
Term
What is resisitance?
Definition
Resistance is an opposition to electric current.
Term
What energy change takes place in a resisitor?
Definition
electrical energy is changed into heat energy.
Term
What does the live wire carry?
Definition
HIGH ENERGY current
Term
What colour is the live wire?
Definition
brown
Term
What colour is the neutral wire?
Definition
blue
Term
What colour is the earth wire?
Definition
green and yellow
Term
What type of circiit would you find in household wiring?
Definition
parallel
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