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WorksheetsPower, resistance and resistivity within a DC circuit.
Total questions: 35
Worksheet time: 35mins
Electric potential ____________ as distance increases.
Increases
Decreases
Remains Constant
Is 0
What is the resistance if the current is 2A and the voltage is 10V?
8 Ω
20 Ω
12 Ω
5 Ω
A 4000-Ω resistor is connected across a 220-V power source. What current will flow through the resistor?
0.055 A
1.8 A
5.5 A
18 A
A 200-W light bulb is connected across a 100-V dc power supply. What current will flow through this bulb?
0.90 A
0.36 A
0.60 A
2.0 A
What characteristics impact resistance of a wire within a circuit?
Thickness
Material
Length
All of these
The difference in electrical potential energy is called what?
current
electric power
resistance
voltage
The movement of electrically charged _____ is called electric _____
particles, transport
particles, current
ions, current
ions, transport
To have a complete electric circuit, the path must be _____
small
big
closed
open
The flow of electrons is counted _____ and is referred to as the _____
in quantities, ampere
one by one, ampere
in quantities, SI unit
one by one, SI unit
An electric current is made up of _____ charged electrons
neutral
positive
negative
balanced
Can DC be converted into AC?
True
False
Metals such as copper and aluminum are good ______________.
insulators
circuits
conductors
charges
A circuit with only one path for the current to flow is a __________________.
parallel circuit
device
series circuit
mini circuit
You measure the resistance of a piece of wire as 7.89 mΩ. It has a diameter of 1.2 centimeters and a length of 30 centimeters. Calculate the resistivity of the wire.
2.97 mΩ⋅m
11.8 mΩ⋅m
119 mΩ⋅m
24.8 Ω⋅m
A 220 Ω resistor has a voltage of 3.3 V across it. Calculate the current through the resistor.
30 mA
15 mA
15 A
45 mA
Calculate the current through the resistors in the circuit above.
9.09 mA
3.22 mA
7.44 mA
6.68 mA
What is Voltage?
The potential energy of an electrical supply stored as an electrical charge
The flow of electrons in a circuit
The resistance of the flow of electricity in a circuit
The amount of energy absorbed or produced within a circuit.
How is power measured?
Watts
Ohms
Volts
Amps
Which part of the atom is responsible for generating electricity?
Electron
Proton
Neutron
Nucleus
Which of the following does not refer to electrical energy?
Volt-ampere
Joule
Watt-second
Volt-coulomb
If two resistances of 9 Ω and 6 Ω are connected in parallel, the total resistance is
54 Ω
0.3 Ω
15 Ω
3.6 Ω
Conventional flow assumes charges flow from
Positive to negative
Positive to positive
Negative to positive
Negative to negative
Electron flow assumes charges flow from
Negative to positive
Negative to negative
Positive to negative
Positive to positive
The power dissipated over a 4 ohm resistor in a circuit of 6 volts is?
24 Watts
10 Watts
9 Watts
1.5 Watts
The power dissipated over a 9 ohm resistor in a circuit of 16 amp's is?
441 Watts
144 Watts
2304 Watts
15 Watts
If a copper conductor 1.72×10-8 Ωm is 45m long and has a cross sectional area of 10mm2, Calculate the resistance with in the circuit.
0.0814Ω
2.57Ω
1.69Ω
0.0774Ω
If a copper cable (1.72×10-8 Ωm) 20m long has a resistance of 0.1376Ω, what is the C.S.A.
2.5mm2
1.5mm2
4.0mm2
10mm2
If a copper cable (1.72×10-8 Ωm) 50m long has a resistance of 0.0215Ω, what is the C.S.A.
2.5mm
6.0mm
4.0mm
1.0mm
If a copper cable (1.72×10-8 Ωm) a C.S.A of 2.5mm and has a resistance of 0.1032Ω, what is the length .
30M
21M
35M
15M
If a copper cable (1.72×10-8 Ωm) a C.S.A of 1.5mm and has a resistance of 0.573Ω, what is the length .
50M
25M
12M
80M
Which one is a poor conductor of electricity?
Human body
Dry Wood
Sea water
Earth
The resistance of a conductor is directly proportional to its length
True
False
Electricity flowing through a wire is like water flowing through a hose. More water can flow through a wide hose than a narrow hose. In a similar way, more current can flow through a wide wire than a narrow wire.
True
False
