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WorksheetsReview MT 2 SH2
Total questions: 10
Worksheet time: 18mins
A generator produces a current of 40A, how long will it take for a total of 3000 C to flow through the output?
1 minutes
2 minutes
1 minutes and 30 seconds
1 minutes and 15 seconds
Calculate the energy gained by an electron when it is accelerated through a potential difference of 50 kV.
8.0 x 10-15 J
1.6 x 10-15 J
3.2 x 10-15 J
4.0 x 10-15 J
The current in an electric immersion heater in a school experiment is 6.3 A when the p.d across it is 12V. Calculate the resistance and the power of the heater.
1.9 Ω, 76 W
2.3 Ω, 96 W
2.5 Ω, 86 W
2.7 Ω, 106 W
Calculate the resistance per metre at room temperature of a constant wire of a diameter 1.25 mm. The resistivity of the wire at room temperature is 5.0 x 10-7 Ω m.
0.32 Ωm-1
0.56 Ωm-1
0.41 Ωm-1
0.73 Ωm-1
When a cell is connected in series with a resistor of 2.0 Ω there is a current of 0.625 A. if a second resistor of 2.0 Ω is put in series with the first, the current falls to 0.341 A. Calculate the internal resistance of the cell and the e.m.f of the cell.
0.4 A, 1.5 V
0.3 A, 1.5 V
0.2 V, 3.0 V
0.5 A, 3.0 V
The current (I) in a copper wire can be calculated using the equation shown.
I = Anvq
What does the symbol v represent?
The average drift velocity of the charge carriers
The instantaneous velocity of the charge carriers
The voltage applied across the wire
The volume of the wire
Which values of current and resistance will produce a rate of energy transfer of 16 J s–1?
I = 1A, R= 4Ω
I = 2A, R= 8Ω
I = 4A, R= 1Ω
I = 16A, R= 1Ω
Gold is sometimes used to make very small connecting wires in electronic circuits.
A particular gold wire has length 2.50 × 10–3 m and cross-sectional area 6.25 × 10–8 m2. Gold has resistivity 2.30 × 10–8 Ω m. What is the resistance of the wire?
3.6 × 10–18 Ω
5.8 × 10–13Ω
9.2 × 10–4 Ω
6.8 × 10–3 Ω
A wire of cross-sectional area 5.0 × 10–6 m2 is made of a metal of resistivity 50 × 10–8 Ω m. The potential difference across the wire is 6.0 V and the current is 3.0 A.
What is the length of the wire?
0.050 m
0.20 m
5.0 m
20 m
A household electric lamp is rated as 240 V, 60 W. The filament of the lamp is made of tungsten from a wire of constant radius 6.0 x 10-6 m. The resistivity of tungsten a normal operating temperature of the lamp is 7.9 x 10-7 Ωm. For the lamp at its normal operating temperature, calculate the current in the lamp.
0.25 A
0.4 A
0.1 A
0.5 A
