# Topic 5 -Electricity and Circuits Flashcards

What is current?

The flow of electric charge - the rate of flow of charge

When is the only time a current will flow through an electrical component?

If there is a potential difference across the component and if the circuit is complete

What is the unit for current?

Ampere (A)

What is potential difference?

- The same as voltage
- the driving force that pushes the charge around the circuit
- the energy transferred per coulomb of charge that passes between two points in an electrical circuitry

What is the unit for voltage/potential difference?

Volt (V)

What is resistance?

Anything that slows the flow of the charge down

What is the unit for resistance?

Ohms (Ω)

How does the potential difference affect the current?

The higher the potential difference across a given component, the higher the current will be

How does resistance affect the current?

The greater the resistance of a component, the smaller the current

In metals what is current caused by?

The flow of electrons

What is the symbol for current?

I

What is the equation relating charge, current and time?

Charge = current x time

Q

I t

When does more charge pass around a circuit in a given time?

When a greater current flows

What is charge measured in?

Coulombs (C)

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