Write definitions for each of the following:

resistor

coulomb

voltmeter
Solution not yet available
Draw a circuit diagram which consists of the following components:

2 batteries in parallel

an open switch

2 resistors in parallel

an ammeter measuring total current

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 \(...\)

rate of energy delivered per unit current

rate at which charge is delivered

rate at which energy is delivered

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?

It is the product of current and the external resistance of
the circuit.

It is a measure of the cell's ability to conduct an electric
current.

It is equal to the “lost volts” in the internal
resistance of the circuit.

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.

How bright is bulb A compared to B and C?

How bright are the bulbs after switch S has been opened?

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


Bulb A will be brighter than B and C as there is more current
flowing through it.

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.)

(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 crosssection of
the conductor per second?

\(It\)

\(\frac{It}{e}\)

\(Ite\)

\(\frac{e}{It}\)

\(\frac{I}{e}\)
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