Current Electricity
Physics ⇒ Electricity and Magnetism
Current Electricity starts at 8 and continues till grade 12.
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See sample questions for grade 11
Define electric current in terms of charge and time.
Describe the effect of temperature on the resistance of a metallic conductor.
Explain the difference between direct current (DC) and alternating current (AC).
Explain why a fuse is always connected in series with the electrical device it protects.
If the resistance of a wire is doubled and the potential difference is kept constant, what happens to the current?
State Kirchhoff's Voltage Law (KVL).
State Ohm's Law.
A copper wire has a resistance of 2 Ω at 20°C. If the temperature coefficient of resistance is 0.004/°C, what will be its resistance at 30°C?
A student connects a 9 V battery to a lamp with a resistance of 3 Ω. What is the current through the lamp?
Which of the following devices is used to measure electric current?
(1) Voltmeter
(2) Ammeter
(3) Galvanometer
(4) Rheostat
Which of the following is a correct statement about superconductors?
(1) They have infinite resistance at low temperatures.
(2) They have zero resistance at low temperatures.
(3) They are always magnetic.
(4) They do not conduct electricity.
Which of the following is NOT a factor affecting the resistance of a conductor?
(1) Length
(2) Temperature
(3) Color
(4) Material
Which of the following is the correct formula for electrical power?
(1) P = IV
(2) P = I/R
(3) P = V/I
(4) P = IR
The energy consumed by a 100 W bulb in 2 hours is ________ joules.
The reciprocal of resistance is called ________.
The resistance of a wire depends on its length, cross-sectional area, and ________.
The resistivity of a material depends on its ________ and temperature.
State whether the following statement is true or false: Metals have a large number of free electrons.
True or False: The direction of conventional current is opposite to the flow of electrons.
True or False: The drift velocity of electrons increases if the electric field in a conductor is increased.
