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WorksheetsDC current
Total questions: 19
Worksheet time: 37mins
Which of the following describes about Ohm's Law
V = IR
Q = IT
R = ρL/A
ΣIin = ΣIout
ΣVloop = 0
A 4.50 V battery is connected to a bulb whose resistance is 1.30 Ω. What is the current that passes through the resistor? (Give your answer in 3 s.f.)
*Remember to include the unit*
(a)
A 4.50 V battery is connected to a bulb whose resistance is 1.30 Ω. Find the total charge that leaves the battery per minute?
207.7
346.6
351.2
450
A 4.50 V battery is connected to a bulb whose resistance is 1.30 Ω. However many electrons leave the battery per minute? Given the charge of electron = 1.60 X 10-19 C
1.30 X 1021
2.08 X 1019
2.16 X 1019
3.16 X 1021
What is the current in the element of an electric cloth dryer with a resistance of 8.60 Ω when it is connected to 240 V? (write your answer in 3 s.f.)
*Remember to include the unit*
(a)
How much charge passes through the element (in 50 minutes) of an electric cloth dryer with a resistance of 8.60 Ω when it is connected to 240 V? (write your answer in 3 s.f.)
27900
83700
1395
1674
which of the following will increase the resistivity of wire?
increase of the length of wire
increase of temperature of wire
increase of the size of wire
increase of the voltage of the circuit
increase of the current of the circuit
which of the following will increase the resistance of wire?
increase of the length of wire
increase of temperature of wire
increase of the size of wire
increase of the voltage of the circuit
increase of the current of the circuit
Calculate the resistance of a cooper wire with length 12.0 m and diameter 0.2 mm. Given the resistivity of copper is 1.7x 10-8 Ωm. Write your answer to 2 s.f.
Answer: (a) Ω
A cooper wire length 12.0 m and diameter 0.2 mm has resistivity of 1.7x 10-8 Ωm at 20oC. If the temperature coefficient of resistance is 3.9x10-3 oC-1, calculate the resistance of the cooper wire at 90oC.
8.26 Ω
6.49 Ω
4.71 Ω
6.76 Ω
At a temperature of 20.0oC, the resistance of an iron wire and gold wire are 11.8 and 13.4 respectively. Determine the temperature at which both wires have the same resistance. Given the temperature coefficient for Gold = 0.0034 oC-1, iron = 0.00651 oC-1
71.2oC
51.2oC
514 oC
494 oC
The rod in Figure 1 is made of two materials. The figure is not drawn to scale. Each conductor has a square cross section 3.00 mm on a side. The orange material has a resistivity of 4.00 × 10–3 Ω · m and is 25.0 cm long, What is the resistance of the orange material?
111 Ω
267 Ω
378 Ω
78.4 Ω
The rod in Figure 1 is made of two materials. The figure is not drawn to scale. Each conductor has a square cross section 3.00 mm on a side. The green material has a resistivity of 6.00 × 10–3 Ω · m and is 40.0 cm long. What is the resistance of the green material?
111 Ω
267 Ω
378 Ω
78.4 Ω
The rod in Figure 1 is made of two materials. The figure is not drawn to scale. Each conductor has a square cross section 3.00 mm on a side. The first material has a resistivity of 4.00 × 10–3 Ω · m and is 25.0 cm long, while the second material has a resistivity of 6.00 × 10–3 Ω · m and is 40.0 cm long. What is the resistance between the ends of the rod?
111 Ω
267 Ω
378 Ω
78.4 Ω
The rod in figure is made of 2 materials, where orange colour material is wrapped by green colour material. Given the orange colour material has a total resistance of 111 Ω while green colour material has a total resistance of 267 Ω. What is the total resistance of the rod?
78.4 Ω
378 Ω
189 Ω
156 Ω
A cell with e.m.f. 1.50 V is connected in series with a lamp. When 2.0 C charge flows through the lamp in 4.0 s, the energy dissipated is 2.80 J. What is the energy provided by the cell to drive 2.0 C of charge round the circuit? (Give your answer in 2 s.f.)
*Remember to include the unit*
(a)
A cell with e.m.f. 1.50 V is connected in series with a lamp. When 2.0 C charge flows through the lamp in 4.0 s, the energy dissipated is 2.80 J. What is the current? (Give your answer in 2 s.f.)
*Remember to include the unit*
(a)
A tungsten filament lamp is marked 60 W, 240 V. What is the resistance of the filament at its normal working temperature of 1200 oC?
4.00 Ohm
40 Ohm
960 Ohm
9.60 Ohm
A tungsten filament has resistance of 960 Ohm under normal working temperature of 1200 oC? What is the resistance of the filament at 30oC? (Temperature coefficient of tungsten = 4.5 X 10-3 Ωm)
225.1 Ω
153.2 Ω
-225.1 Ω
-153.2 Ω
