WorksheetsPHYSICS ASSIGNMENT ON ELECTRICITY IB
Total questions: 20
Worksheet time: 26mins
An electrical conductor has a resistance of 5.6kΩ. A potential difference of 9.0V is applied across its ends.
How many electrons pass a point in the conductor in one minute?
6.0 × 1020
1.0 × 1019
6.0 × 1017
1.0 × 1016
Which measurements are required to calculate the resistivity of the metal of a wire?
p.d., current, area, length
p.d., current, diameter, length
resistance, area, length
resistance, length, radius
The graph shows the current/voltage characteristics of a filament lamp.
The resistance of the filament at 4.0 V is
250 Ω
4 000 Ω
8 000 Ω
64 000 Ω
A fully charged 12V car battery can supply a charge of 100kC. The car's starter motor requires a current of 200A for an average period of 2.0 s.
Due to a fault, the battery does not recharge. What is the maximum number of times the car's starter motor can be used?
21
25
42
250
Four wires are made of the same metal. The cross-sectional areas, lengths, and thermodynamic temperatures of the wires are shown. Which wire has the largest resistance?
Wire A
Wire B
Wire C
Wire D
Which of the following is a correct statement of Ohm’s law?
The resistance of a conductor is always constant
The current in a conductor is always proportional to the potential difference across the conductor.
The resistance of a conductor increases with increasing temperature.
The resistance of a conductor is constant only if the temperature of the conductor is constant.
The work done on a positive point charge of magnitude 3.0 nC as it is moved at constant speed from one point to another is 12 nJ. What is the potential difference between the two points?
0.0 V
0.25 V
4.0 V
36 V
The graph below shows the variation in current I of the potential difference V across a filament lamp.
The resistance of the lamp when I = 1.5 mA is:
950 Ω
400 Ω
0.95 Ω
0.40 Ω
The electric field strength at a point may be defined as:
The force exerted on a unit positive charge placed at that point.
The force per unit positive charge on a small test charge placed at that point.
The work done on a unit positive charge to move the charge to that point from infinity.
The work done per unit positive charge to move a small test charge to that point from infinity.
The graph shows the variation in the current I with the applied potential difference V in an electrical component.
Which one of the following gives the resistance of the component at point P?
The gradient of the line at P
The reciprocal of the gradient of the line at P
The ratio V1I1
The ratio I1V1
Which of the following statements are true?
1. An ideal ammeter should have infinite resistance.
2. An ideal ammeter should have zero resistance.
3. An ideal voltmeter should have infinite resistance.
4. An ideal voltmeter should have zero resistance.
1 and 3
2 and 4
2 and 3
1 and 4
Point P is at the same distance from two charges of equal magnitude and opposite sign.
What is the direction of the electric field at point P?
A pair of charged, parallel metal plates have voltages as shown in the figure below.
The work required to move a small positive test charge from Plate 2 to Plate 1 is:
greatest for path X
greatest for path Y
greatest for path Z
the same for all paths
Two charged plastic balls are separated by a distance d in a vertical insulating tube, as shown.
The charge on each ball is doubled.
Coulomb’s law applies to the force between the balls and friction with the walls of the tube is negligible. What is now the separation of the balls?
2d
d
2d
4d
An electrical cable consists of seven strands of copper wire, each of diameter 0.30 mm, connected in parallel. The resistivity of copper is 1.72 × 10–8Ω m. The current in the cable is 13A.
What is the potential difference (p.d.) between two points on the cable a distance of 1.0 m apart?
0.0045V
0.11V
0.45V
3.2V
A potential difference of 6 V is applied to a component, providing a current of 3 A for 2 minutes.
During this time, what is the charge flowing through the component?
6 C
36 C
360 C
2160 C
Which of the following expresses the Volt in S.I base units?
kg m2 s-2 C-1
kg m2 s-3 C
kg m2 s C-1
kg m2 s-3 C-1
All electrical components have resistance. In which of the following situations would the resistance of the stated component not increase?
Increasing the current through a filament lamp.
Increasing the temperature of a metal wire.
Increasing the temperature of a negative temperature coefficient thermistor.
Reversing the direction of a diode in forward bias in a circuit.
Six identical 12Ω resistors are arranged in two groups, one with three in series and the other with three in parallel.
What are the combined resistances of each of these two arrangements?
Which diagram best represents the field lines in the electric field produced by a combination of one point positive charge and one point negative charge?
