Write definitions for each of the following:
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resistor
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coulomb
-
voltmeter
Solution not yet available
Draw a circuit diagram which consists of the following components:
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2 batteries in parallel
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an open switch
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2 resistors in parallel
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an ammeter measuring total current
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a voltmeter measuring potential difference across one of the
parallel resistors
Solution not yet available
Complete the table below:
Quantity
|
Symbol
|
Unit of measurement
|
Symbol of unit
|
e.g. Distance
|
e.g. D
|
e.g. kilometre
|
e.g. \(\text{km}\)
|
Resistance
|
|
|
|
Current
|
|
|
|
Potential difference
|
|
|
|
Solution not yet available
[SC 2003/11] The emf of a battery can best be explained as the \(...\)
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rate of energy delivered per unit current
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rate at which charge is delivered
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rate at which energy is delivered
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charge per unit of energy delivered by the battery
Solution not yet available
[IEB 2002/11 HG1] Which of the following is the correct definition of the emf
of a battery?
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It is the product of current and the external resistance of
the circuit.
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It is a measure of the cell's ability to conduct an electric
current.
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It is equal to the “lost volts” in the internal
resistance of the circuit.
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It is the power supplied by the battery per unit current
passing through the battery.
Solution not yet available
[IEB 2005/11 HG] Three identical light bulbs A, B and C are connected in an
electric circuit as shown in the diagram below.
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How bright is bulb A compared to B and C?
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How bright are the bulbs after switch S has been opened?
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How do the currents in bulbs A and B change when switch S is
opened?
|
Current in A
|
Current in B
|
(a)
|
decreases
|
increases
|
(b)
|
decreases
|
decreases
|
(c)
|
increases
|
increases
|
(d)
|
increases
|
decreases
|
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Bulb A will be brighter than B and C as there is more current
flowing through it.
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Bulb A and B will be equally bright, but bulb C will not be
lit up. (When the switch opens, no current flows through
bulb C and bulbs A and B are now in series.)
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(a). The current in A decreases, but the current in B
increases.
[IEB 2004/11 HG1] When a current \(\text{I}\)is maintained in a conductor for
a time of t, how many electrons with charge e pass any cross-section of
the conductor per second?
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\(It\)
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\(\frac{It}{e}\)
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\(Ite\)
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\(\frac{e}{It}\)
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\(\frac{I}{e}\)
If you have a circuit consisting of \(\text{4}\) resistors of equal
resistance in series and the total voltage across all of them is
\(\text{17}\) \(\text{V}\), what is the voltage across each of them?
Solution not yet available
If you have a circuit consisting of \(\text{4}\) resistors of equal
resistance in parallel and the total voltage across all of them is
\(\text{17}\) \(\text{V}\), what is the voltage across each of them?
Solution not yet available
In a circuit consisting of a battery and \(\text{3}\) resistors in series,
what is the voltage across the first resistor if the voltage across the
battery is \(\text{12}\) \(\text{V}\) and the voltages across the other
two resistors is \(\text{3}\) \(\text{V}\) and \(\text{2}\) \(\text{V}\)
respectively?
Solution not yet available
There are \(\text{3}\) resistors in parallel with resistances of \(\text{3}\)
\(\text{Ω}\), \(\text{4}\) \(\text{Ω}\) and \(\text{11}\)
\(\text{Ω}\). What is the total resistance of the parallel
combination?
Solution not yet available
The same three resistors as above are now arranged in series, \(\text{3}\)
\(\text{Ω}\), \(\text{4}\) \(\text{Ω}\) and \(\text{11}\)
\(\text{Ω}\). What is the total resistance of the series
combination?
Solution not yet available
The total resistance of two resistors in parallel is \(\text{3}\)
\(\text{Ω}\), the one resistor has a resistance of \(\text{5}\)
\(\text{Ω}\), what is the resistance of the other resistor?
Solution not yet available
In a series circuit there are \(\text{3}\) resistors with voltages of
\(\text{2}\) \(\text{V}\), \(\text{5}\) \(\text{V}\) and \(\text{8}\)
\(\text{V}\), what is the voltage across the battery in the circuit?
Solution not yet available
In a parallel circuit there are \(\text{3}\) resistors with voltages of
\(\text{2}\) \(\text{V}\), \(\text{2}\) \(\text{V}\) and \(\text{2}\)
\(\text{V}\), what is the voltage across the battery in the circuit?
Solution not yet available