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WorksheetsTest - Electrical Quantity
Total questions: 25
Worksheet time: 50mins
A wire has a certain electrical resistance.
The diameter and length of the wire may be changed.
Which pair of changes must cause the resistance of the wire to increase?
A
B
C
D
The diagram shows a piece of metal resistance wire. Which wire, made of the same metal, has a smaller resistance?
a wire of greater length with the same diameter
a wire of the same length with a smaller diameter
a wire of greater length with the same diameter
a wire of the same length with a larger diameter
A small heater has a rating of 15 V, 4 A. How much energy does it consume if it is turned on for two minutes?
7.5 J
120 J
450 J
7200 J
A resistor of resistance R is connected to a battery of e.m.f. V.
There is a current I in the resistor.
Power P is dissipated by the resistor, and in time t the energy transferred is E. Which expression is correct?
P=VIR
E=IVt
E=PIt
P=V/R
Which produces an electromotive force (e.m.f.)?
a rubber
a battery
a resistor
a spring balance
What is the unit of measurement of resistance?
Amperes
Ohms
Volts
A circuit is set up to measure the resistance of a resistor R. The meter readings are 2 A and 3 V.
What is the resistance of the resistor R?
0,67Ω
1,5Ω
5,0Ω
6,0Ω
The rate of flow of electrons through a wire is known as __________ and is measured using __________.
resistance, Ohms
voltage, Volts
current, Ampere
The tendency for materials to oppose the flow of electricity is known as __________ and is measured using ___________.
resistance, Ohms
current, Ampere
voltage, Volts
____________ __________ is what actually happens. The electrons flow out of the negative side of the battery, through the circuit, and back to the positive side of the battery.
Conventional Current
Ohm's Law
Electron flow
Kirchhoff's Current Law
40 C of charge flows through a copper wire in 10 s.
What is the current?
40A
20A
400A
4A
Remember: V=IR and P=VI
What is the unit of Electrical Power?
Joule
Watt
Where
Amp
A kilowatt (kW) is how many watts?
10
50
100
1000
A medium (material) that slows down or stops thermal or electrical energy as it passes through.
Insulator
Conductor
Circuit
Open Circuit
Switch
According to the diagram, what does the battery in an electrical circuit represent?
A source of resistance
A source of current
A source of voltage
A source of power
How much I3? (a) A
How much I4? (a) A
How much I3? (a) A
