Current is the rate of flow of electric charge (electrons) around a circuit.Current only flows if there's a potential difference across that component & if the circuit is complete(closed).Unit:A (ampere)

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What is Potenial Difference & unit?

P.d also known as voltage. This is driving force that pushes the current around the circuit.Unit:V (Volt).Also,is the energy transferred per coulomb of charge

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What is Resistance & its unit?

measure of how easily charge can flow(current).Unit:ohm(look up the special unit symbol in revision guide)

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How does the p.d & resistance affect the current?

More P.D=higher current More resistance=smaller current

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What is equation for charge?Units included

Charge (C)=current(A) x time(s) Charge is measured in coulombs

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What is the equation to calculate the energy transferred per coulomb of charge?

energy transferred(J) = charge(C) x Potential Difference (V)

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What does Ammeter do?

measures the current flowing thru component.Never place parallel to voltmeter and must be placed in series

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What does Voltmeter do?

measures p.d across component e.g. light bulb.Must be placed parallel with component under test.Not with a variable resistor/battery-so it can compare the energy the charge has before & after passing thru component

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How do you calculate potential difference?

Potential difference (V) = Current (A) x Resistance (ohms)

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Other cards in this set

Card 2

Front

What is Potenial Difference & unit?

Back

P.d also known as voltage. This is driving force that pushes the current around the circuit.Unit:V (Volt).Also,is the energy transferred per coulomb of charge

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