Topic 2 - Revision Questions

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If there are 4 Amps flowing down the main junction and 3 Amps in a cross junction, how many amps flow down the lower junction?
4 Amps - 3 Amps = 1 Amp
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What would happen to the Current in the circuit if you double the Potential Difference?
Potential Difference (V) = Current (I) x Resistance (Ohms) - V (x2) = I (x2) x R - The Current would also double.
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E = I x V x t - What does this formula mean and what are the units?
Energy (Joules) = Current (Amps) x Voltage (Volts) x time (seconds)
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How many joules are required when a Current of 0.5A flows for 1 minute from 2 AA batteries?
1 AA battery = 1.5 Volts,2 AA batteries = 3 Volts... Energy (J) = Current (A) x Voltage (V) x time (s)... Energy = 0.5 x 3 x 60... = 90 Joules
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What does a Voltmeter measure?
The Potential Difference (Voltage).
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What is Potential Difference and what are the units?
Potential Difference is the Voltage - it is measured in Volts... Potential Difference is the amount of energy a charge transfers between 2 points in a circuit.
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Investigate the relationship between Potential Difference V = IR (Voltage, Current and Resistance
Voltage = Current x Resistance... Voltage is 'proportional' to Current.
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V = I x R - What does this formula mean and what are the units?
Voltage (Volts) = Current (Amps) x Resistance (Ohms)
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P = I x V - What does this formula mean and what are the units?
Power (Watts) = Current (Amps) x Voltage (Volts)
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Why do metals get hot when a current flows through them?
Electrons are colliding with the Atoms in the wire, therefore this creates Friction. Friction gives out heat.
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How many amps must be flowing through a 60W lamp connected to a 230V source?
Current = Power ÷ Voltage... Current = 60 ÷ 230... Amps = 0.208695652173913043478 = 0.3 Amps
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Other cards in this set

Card 2

Front

What would happen to the Current in the circuit if you double the Potential Difference?

Back

Potential Difference (V) = Current (I) x Resistance (Ohms) - V (x2) = I (x2) x R - The Current would also double.

Card 3

Front

E = I x V x t - What does this formula mean and what are the units?

Card 4

Front

How many joules are required when a Current of 0.5A flows for 1 minute from 2 AA batteries?

Card 5

Front

What does a Voltmeter measure?

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