|
Each
of the resistors in
the circuit below
has a resistance R
Ohms. What is their
total resistance (in
terms of R). |
|
 |
Question
2
|
a) |
Four identical
resistors are
connected to a
battery of emf 12V and zero internal resistance, as shown below. |
| |
 |
| |
What voltage would a
voltmeter read when
connected across the
following points? |
| |
|
i) |
A and D |
|
ii) |
A and B |
|
iii) |
A and C |
|
iv) |
B and C |
|
|
b) |
A short circuit (a
wire of very low
resistance) is
connected across
points C and D, as
shown below. |
| |
 |
| |
What voltage would a
voltmeter now read
when connected
across the following
points?
|
| |
|
i) |
A and D |
|
ii) |
A and B |
|
iii) |
A and C |
|
iv) |
B and C |
|
Question
3
|
a) |
Calculate the total
resistance of the
four resistors in
the circuit shown
below. |
| |
 |
|
b) |
Calculate the total
resistance of the
same four resistors
when a wire of very
low resistance is
connected across
points X and Y. |
Questions 4 to 11 are all about the circuit drawn
below. The cell has zero internal resistance
Question
4
Calculate
the total resistance of the circuit.
Question
5
Calculate
the current
I.
Question
6
Calculate
the voltage across the points A and B.
Question
7
Calculate
the current
I1.
Question
8
How
much charge will pass through the cell in 20s?
Question
9
How much
energy will be converted to heat by the
6W
resistor in 5 minutes?
Question
10
Calculate
the power dissipated in the
8W
resistor.
Question
11
Calculate
the total amount of energy converted to heat by all the
resistors in 10 minutes
Question
12
|
Calculate the maximum current which can be
supplied by each of the following batteries |
|
a) |
a
car battery of emf
 =
13·2V
and internal resistance r = 0·15W |
|
b) |
a
battery of eight cells each of emf
= 1·6V
and internal resistance r = 0·4W |
Question
13
|
Two
resistors, R1 =
3W
and R2 =
6W,
are connected in parallel with each other. They
are then connected to a battery of emf,
=10V
and internal resistance r =
3W.
|
|
Calculate |
a) |
the
current flowing through the battery |
| |
b) |
the
current flowing through the
6W
resistor. |
Question
14
|
A
battery of emf,
= 6V is
connected to two
5W
resistors in parallel with each other. If the
current flowing through the battery is
2A,
calculate the internal resistance of the battery.
|
Question
15
|
Three 12W
resistors are to be connected to a battery of
= 24V
and r = 2W.
Draw circuit diagrams showing how the resistors
should be connected in order that the current
flowing through the battery is |
|
a) 4A |
b)
1·2A |
c)
0·63A |
d)
2·4A |
|
Question
16
|
This question is about rms currents and voltages. |
|
 |
|
For
the circuit shown above calculate |
|
a) |
the
rms value of the current,
I |
| b) |
the
maximum value of the current |
| c) |
the
mean power dissipated in R1 |
| d) |
the
rms value of the voltage across R2. |
The Open Door Web Site 