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Electricity Flashcards

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0
Q

What is the unit of electric current? [2003 OL][2011 OL]

A

Ampires

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1
Q
  1. What is an electric current? [2010][2006] [2008 OL][2006 OL][2004 OL][2003 OL][2002 OL][2011 OL]
A

An electric current is a flow of charge.

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2
Q
  1. Define potential difference. [2009][2005] [2004][2002 OL]
A

Potential difference is the work done in moving a charge of 1 Coulomb from one point to another.

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3
Q

Define the volt [2013]

A

The potential difference between 2 points is one volt if 1 Joule of work is done to move a charge of 1 Colombo from one point to the other

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4
Q
  1. Explain the term emf. [2003]
A

Electromotive force term used to describe potential difference when it applies to the full circuit

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5
Q
  1. Name a source of potential difference. [2008 OL]
A

Battery

Thermocouple

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6
Q

Used to measure potential difference

A

Voltameter

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7
Q
  1. Define capacitance. [2009][2008] [2004][2002 OL]
A

Capacitance of a conductor is the ratio of charge on the conductor to its potential

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8
Q

Use of the capicitor

A

Store charge
Store energy
Phone charger
Tuning (radio)

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9
Q
  1. List the factors that affect the capacitance of a parallel plate capacitor. [2006]
A

Permittivity of the dielectric between the plates
Distance between the plates
Common area

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10
Q
  1. Define resistance. [2007][2005][2012]
A

The resistance of a conductor is the ratio of the potential difference ACROSS the conductor to the current flowing THROUGH it.

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11
Q
  1. State Ohm’s Law [2007 OL][2006 OL][2005 OL][2010 OL]
A

Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference across it, assuming constant temperature.

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12
Q
  1. Define resistivity. [2008] [2007] [2002]
A

Resistivity is defined as the resistance of a cube of material of side one metre.

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13
Q
  1. Give the unit of resistivity. [2008]
A

The ohm-metre

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14
Q
  1. Give two uses for the multimeter. [2008 OL]
A

As a voltmeter , ammeter, ohmmeter

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15
Q
  1. Explain why the resistance of the bulb is different when it is not connected to the mains. [2006]
A

Cold filament has lower resistance

Resistance becomes mo

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