13.1 Circuit rules Flashcards

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1
Q

At any junction in a circuit, the total current leaving the junction is equal to…

A

…the total current entering the junction

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2
Q

For a component in series:

The current entering a component is…

A

…the same as the current leaving the component

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3
Q

For a component in series:

The current passing through two or more components in series is…

A

…the same through each component

This is because the rate of flow of charge through each component is the same at any instant

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4
Q

What is the potential difference between any two points in a circuit defined as

A

The energy transfer per coulomb of charge that flows from one point to the other

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5
Q

If the charge carriers lose energy, the potential difference is a potential ______.

A

Drop

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6
Q

If the charge carriers gain energy, which happens when they pass through a battery or cell, the potential difference is a potential ______ equal to the pd across the battery or cell’s terminals.

A

Rise

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7
Q

For two or more components in series, the total pd across all the components is equal to…

A

…the sum of the potential differences across each component

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8
Q

The pd across components in parallel is…

A

…the same

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9
Q

For any complete loop of a circuit, the sum of the emfs round the loop is equal to…

A

…the sum of the potential drops around the loop

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10
Q

What is the total emf in a loop

A

The total electrical energy per coulomb produced in the loop and the sum of the potential drops is the electrical energy per coulomb delivered round the loop

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11
Q

What happens each time a charge carrier goes round the circuit

A

A certain amount of energy E is transferred to it from the battery
It transfers energy equal to E/3 to the variable resistor, and 2E/3 to the light bulb

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