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Physics > 2.3 D.C. Circuits > Flashcards

2.3 D.C. Circuits Flashcards

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1
Q

What is current measured in?

A

A, Amperes

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2
Q

How is current in a circuit measured?

A

With an Ammeter in series

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3
Q

Ammeters have …

A

Negligible resistance

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4
Q

Electrical current

A

The rate of flow of charge

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5
Q

The value of current in series is …

A

The same at all points

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6
Q

The value of current in parallel branches of a circuit …

A

Adds up to equal to the total current value

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7
Q

When a current enters a junction the …

A

Sum of the current entering is equal to the sum of the current exiting. due to the conservation of charge

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8
Q

What is potential difference measured in?

A

V, volts

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9
Q

How is potential difference measured?

A

With a Voltmeter in parallel across the component

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10
Q

The Potential difference across two components … the potential difference across the …

A

Equals
Source

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11
Q

The sum of the potential difference across components in a series circuit is …

A

Equal to the potential difference across the supply. This is a consequence of the conservation of energy

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12
Q

The potential difference across parallel components is …

A

All the same

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13
Q

The total resistance in a series circuit is the …

A

sum of all the resistances of the individual components

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14
Q

The total resistance in a parallel circuit is the …

A

sum of all of the resistances under one. Since the current is split more times the resistance will be less

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15
Q

Resistivity

A

The resistance of a wire of the material of unit length

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16
Q

Resistance

A

Is the volts per ampere

17
Q

What is a potential divider used for?

A

The potential divider is used to control the amount of volts supplied to a certain component. by using other resistors to take portions of the unwanted V

18
Q

EMF, Electro Motive Force

A

Of a source is the energy converted from some other form into electrical potential energy per coulomb of charge passing through the source

19
Q

What is the unit of EMF?

A

V, Volt, same as potential difference

20
Q

What is the equation for internal resistance

A

V = E - Ir
E = emf
V = P.d
Ir = lost volts or Internal resistance

Physics (16 decks)

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