ELECTRICAL TERMINOLOGY

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Increase in the resistance of a 1 ohm sample of a conductor, per degree rise in temperature above 0° Centigrade (C),the assumed standard, is called

2 points

heat of resistance

resistivity

temperature coefficient

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If the cross sectional area is doubled (other factors remaining constant), resistance is

2 points

halved

doubled

constant

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Device which uses electro-mechanical energy to maintain the potential difference

2 points

generator

battery

solar cell

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The unit of conductance is

2 points

Siemens

ohm / meter

1/ siemens

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The resistance of a few alloys, such as constantan, ________ as the temperature increases

2 points

change very little

increases

decreases

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A light bulb connected between the terminals of a battery. Which of the following is not true

2 points

Chemical energy is being converted to electrical energy by the battery

electrical energy is being converted to heat energy in the conductor

Chemical energy is being converted to heat energy by the conductor

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The unit of quantity for electricity is the

2 points

Amperes

Coulomb

Volts

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Unit of resistivity is

2 points

ohm . meter

ohm / meter

meter/ ohm

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For all practical purposes, the earth is considered to be

2 points

neutral

positively charged

negatively charged

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which of the following is true regarding EMF

2 points

It is less than maximum voltage

It is not responsible for the flow of current in the cell

It is the maximum voltage that can be obtained from the cell

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rate of flow of one coulomb per second

2 points

volts

amperes

charge

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______ has less resistivity than copper

2 points

Iron

aluminium

silver

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Electric current travel at more than

1 point

186 000 km/h

186 000 miles/sec

299 000 m/s

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the decreasing order of conductivity is

2 points

silver, copper, aluminium, gold

gold, silver, copper, alluminium

silver, copper, gold, aluminium

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If the length is doubled (other factors remaining constant), resistance is

2 points

halved

doubled

constant

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There are three types of charge carriers, namely,

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electrons, protons and ions

electrons, coulombs and ions

electrons, holes and ions

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Resistance of a conductor can be increased by

2 points

increasing voltage

increasing current

none of the above

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The resistance of a piece of material is one ohm if a potential difference of one volt applied across it

2 points

causes a current of one ampere to flow

resist a current of one ampere to flow

is directly proportional to the current flowing

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When the emf of a supply is concerned, it is one volt if the amount of energy converted into electrical energy is

1 point

one joule per second

one joule for each coulomb of electricity

one ampere for each coulomb of electricity

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