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L Theory Revision > Current, voltage & resistance > Flashcards

Current, voltage & resistance Flashcards

1
Q

What does the nucleus of an atom contain?

A

Protons

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2
Q

In a balanced atom, the protons are equal to the amount of …..

A

Electrons

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3
Q

What is the name of the force that holds the electrons to the nucleus of an atom?

A

The force of attraction.

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4
Q

What is the name of the outer most electron on the outer most shell?

A

Valence electron, valence shell.

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5
Q

Conventional Flow

A

From positive to negative

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6
Q

Movement of free electrons along a conductor

A

Current

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7
Q

Electron Flow

A

From negative to positive

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8
Q

Symbol for current

A

Amps (A)

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9
Q

Voltage is also known as the

A

Potential Difference (P.D.) or ElectroMotive Force (EMF)

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10
Q

What is Voltage?

A

Difference in charge between 2 points in a circuit.

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11
Q

EMF is?

A

Force that drives the current around a circuit.

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12
Q

Six methods by which voltage can be produced:

A

Chemical
Friction
Induction
Pressure
Heat
Light

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13
Q

For induction you need:

A

Wire
Magnet
Movement

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14
Q

Resistance is measured in:

A

Ohm’s (omega symbol)

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15
Q

Insulators involved in Resistance (need 6)

A

Wood
Paper
Rubber
Mica
Insulating Varnish
Porcelain
Plastic
Woven Fabrics
Glass

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16
Q

Conductors involved in Resistance (need 6)

A

Copper
Brass
Silver
Carbon
Impure Water (Salt Water)
Aluminium
Platinum
Mercury
Gold

17
Q

4 different factors which affect the resistance of a conductor.

A

Type of material
Length of conductor
Cross sectional area
Temperature

18
Q

Doubling the thickness of insulation, around the conductor

A

Doubles the insulation resistance

19
Q

Halving the thickness of insulation, around the conductor

A

Halves the insulation resistance.

20
Q

Ohm’s Law (in full)

A

Ohm’s Law states that a current flowing through a conductor is directly proportional to the applied voltage across it, providing the temperature remains constant and is inversely proportional to the resistance.

20
Q

Ohm’s Law Triangle

A

. Voltage (V)

Current (I) Resistance (R)

21
Q

Resistors in parallel circuit

A

1/Rt = 1/R1 + 1/R2 + 1/R3 …..

22
Q

Resistors in series circuit

A

Rt = R1 + R2 + R3 ….

L Theory Revision (1 decks)

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