Current Electricity 1
2 years ago
thephysicsgrove
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• Question 1
30 seconds
Q. Define electric current.
It is the work done by the source in driving charges around a complete circuit.
It is a measure of the rate of flow of electric charge through a given cross-section of a conductor.
It is the work done by the source in driving a unit charge around a complete circuit.
It is a measure of the flow of electric charge through a given cross-section of a conductor.
• Question 2
30 seconds
Q. What is the SI unit of electric current?
Watts
Voltage
Joules
Ampere
• Question 3
30 seconds
Q. What do the arrows in the circuit represent?
conventional current
eletromotive force
electron flow
voltage
• Question 4
30 seconds
Q. Which instrument is shown in the picture?
voltmeter
ammeter
galvanometer
multimeter
• Question 5
30 seconds
Q. What is the function of a dry cell?
A conductor that connect the components together.
A method of opening or closing the circuit.
A source of electromotive force that drives electric charges around the circuit.
A load in which moving charges can do a useful job.
• Question 6
30 seconds
Q. What is the following component?
dry cell
fuse
battery
resistor
• Question 7
30 seconds
Q. What is the following component?
dry cell
fuse
resistor
rheostat
• Question 8
30 seconds
Q. What is the following component?
fixed resistor
variable resistor / rheostat
fuse
ammeter
• Question 9
30 seconds
Q. What does the diagram show?
an open circuit
a closed circuit
a short circuit
a long circuit
• Question 10
30 seconds
Q. What is the formula for current?
I = t/Q
I = W/Q
I = Q/t
I = W/t
• Question 11
30 seconds
Q. What is the formula for resistivity of a wire?
R = ρL/A
R = ρLA
R = LA/ρ
R = L/Aρ
• Question 12
30 seconds
Q. The potential difference across a component is 5 V. The current flowing through the component is 10 A. What is the resistance of the component?
2 Ω
0.5 Ω
50 Ω
0.05 Ω
• Question 13
30 seconds
Q. A 10 cm long wire with a cross-sectional area of 5 mm3 has a resistance of 40 Ω. It is then replaced with a wire of the same material, 20 cm long and with a cross-sectional area of 20 mm3. What is the new resistance?
10 Ω
20 Ω
40 Ω
80 Ω
• Question 14
30 seconds
Q. The potential difference across a component is 50 V, and the charge that flows through the component is 25 C. What is the work done to drive these charges through?
0.5 J
2 J
50 J
1250 J
• Question 15
30 seconds
Q. The amount of charge that flows through a component in 5 minutes is 600 C. What is the current through the component?