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WorksheetsUnit 4 - Electricity
Total questions: 26
Worksheet time: 13mins
What is the unit of current?
Volts (V)
Ohms (Ω)
Amperes (A)
Joules (J)
What is the conventional direction of current flow?
Flow of electrons
Flow of ions
Flow of positive charge
Flow of neutrons
What device is used to measure current?
Voltmeter
Ammeter
Thermistor
Resistor
What is the potential difference across each branch in a parallel circuit?
Different for each branch
The same across every branch
Zero for all branches
Only across the first branch
What can overheating of cables lead to?
Increased resistance
Melting of the insulation and fire
Lower current
Reduced voltage
What can damp conditions cause in electrical equipment?
Increased efficiency
Electric shock
Reduced current
Lower voltage
What is a fuse?
A thick piece of wire
A thin piece of wire that melts if the current is too high
A device that increases voltage
A component that decreases resistance
What is the advantage of a circuit breaker over a fuse?
It is cheaper
It can be reset and used again
It is larger
It is more complex
What materials are used in double insulation?
Metal casings
Plastic casings
Rubber casings
Glass casings
What is the unit of energy transferred in an electrical circuit?
Joules (J)
Watts (W)
Volts (V)
Amperes (A)
In an electrical circuit, energy is transferred from chemical energy in the battery to what type of energy?
Thermal energy
Electrical energy
Mechanical energy
Nuclear energy
What is the power of a component measured in?
Joules (J)
Watts (W)
Volts (V)
Amperes (A)
In a direct current (d.c.), the current flows in which direction?
Changes direction continuously
Flows in one direction
Flows in a circular path
Flows randomly
What is the unit of measurement for electric charge?
Ampere
Volt
Coulomb
Ohm
What charge do electrons have?
+1
0
-1
+2
What is a danger of static charges?
Electric shock
Loss of electrons
Increase in temperature
Decrease in pressure
What is the effect of friction on clouds?
It neutralizes the charge
It builds up electrostatic charge
It decreases the charge
It increases the temperature
What happens when electrons are transferred from one material to another?
Both materials become neutral
Both materials become positively charged
One becomes positively charged, the other negatively charged
Both materials lose charge
What is the result of rubbing two insulators together?
They become neutral
They both gain electrons
They become charged
They lose protons
What happens to the paper when a charged comb is brought near it?
It repels the comb
It is attracted to the comb
It loses its charge
It gains protons
What is the role of insulators in electric charge?
They allow electrons to flow through them
They impede the flow of electrons
They neutralize charges
They attract protons
What is the result of a spark during fueling?
Increase in fuel flow
Fire or explosion
Neutralization of charge
Loss of electrons
What is one way to prevent too much electrostatic charge from building up on an insulator?
Increase the charge
Reduce the charge
Add more insulators
Use a stronger current
What is the primary function of a resistor in an electrical circuit?
To store charge
To decrease current
To convert energy
To increase voltage
What happens to the resistance of a conductor as its temperature increases?
Resistance decreases
Resistance becomes zero
Resistance remains constant
Resistance increases
What is the role of a capacitor in an electrical circuit?
To decrease voltage
To store electrical energy
To increase current
To convert energy
