WorksheetsT-level year 1 2.5 -Electricity principles - generation ohms law
Total questions: 52
Worksheet time: 26mins
What is the most widely used fossil fuel for electricity generation?
Oil
Coal
Gas
Nuclear
Which fossil fuel is used for regional generators to create power at times of peak demand?
Gas
Oil
Coal
Nuclear
Why has the use of coal been scaled down in the UK?
It is too expensive
It is highly polluting
It is not efficient
It is scarce
How is nuclear energy released?
By burning fossil fuels
By splitting atoms
By chemical reactions
By solar panels
What are the two ways nuclear energy can be produced?
Combustion and fusion
Fission and fusion
Fission and combustion
Fusion and combustion
What is the National Grid?
A) A network of underground cables for water supply
B) A network of mainly overground cables used to send electricity from generator stations
C) A system of roads for transportation
D) A network of internet cables
What is the highest voltage used in the National Grid transmission system?
A) 132 kV
B) 275 kV
C) 400 kV
D) 500 kV
What are the towers used to carry electricity cables called?
A) Poles
B) Pylons
C) Antennas
D) Masts
How many cables are suspended from pylons used for the 400 kV super grid?
A) Four
B) Five
C) Six
D) Seven
What is electromagnetic induction?
The process of generating electricity using solar panels
The process by which a current can be induced to flow due to a changing magnetic field
The conversion of electrical energy into mechanical energy
The process of storing electrical energy in batteries
What is the function of a step-up transformer?
To decrease the voltage
To increase the voltage
To convert AC to DC
To store electrical energy
Match the following methods with how they change the voltage in a circuit.
By converting electrical energy into heat
Thermal conversion
By using a chemical reaction
Electrochemical process
By changing the voltage in one circuit to a different voltage in a second circuit
Transformer operation
By storing energy in capacitors
Capacitor energy storage
Why might transmission systems need to be run underground at lower voltages in urban areas?
To increase the speed of electricity transmission
To reduce the cost of electricity
To hide the systems and prevent damage to insulation
To improve the efficiency of transformers
What are distribution systems in electricity distribution known as?
Distribution network operators
Power plants
Transmission lines
Generators
Why are voltages stepped down in distribution systems?
To increase power generation
To allow cables to run underground in urban areas
To reduce electricity consumption
To enhance transmission speed
What is the typical voltage of underground cables in towns and cities?
5 kV
11 kV
15 kV
20 kV
What voltage is typically used for equipment such as downlights and central heating controls?
12 V
110 V
230 V
400 V
Which voltage is considered much safer for power tools on a construction site?
12 V
110 V
230 V
400 V
What voltage is commonly used within a domestic property for equipment like televisions and microwaves?
12 V
110 V
230 V
400 V
Which voltage is used for industrial equipment and is typically 3-phase?
12 V
110 V
230 V
400 V
What is electricity?
The flow of protons from one atom to another
The flow of electrons from one atom to another
The flow of neutrons from one atom to another
The flow of atoms from one molecule to another
Which of the following materials is a good conductor of electricity?
Wood
Plastic
Copper
Rubber
What is the SI unit of charge?
Ampere (A)
Volt (V)
Coulomb (C)
Ohm (#)
Which symbol represents current in electrical measurements?
Q
I
V
R
Match the following units with their corresponding physical quantities.
Ohm (Ω)
Resistance
Watt (W)
Power
Volt (V)
Electric Potential
Ampere (A)
Electric Current
What does the symbol 'R' represent in electrical measurements?
Resistance
Power
Charge
Current
What is the flow of electrons in a direct current (DC) circuit?
Electrons flow in a single direction.
Electrons flow in multiple directions.
Electrons do not flow.
Electrons flow randomly.
Which materials make good insulators?
Rubber and PVC
Copper and aluminum
Iron and steel
Gold and silver
What is the SI unit of measurement for charge?
Ampere (A)
Volt (V)
Coulomb (C)
Ohm (#)
In an alternating current (AC) circuit, how does the electric charge flow?
In a single direction
Changes direction periodically
Does not flow
Flows randomly
What does Ohm's law explain?
The relationship between current, voltage, and resistance in an electric circuit
The relationship between power and energy in an electric circuit
The relationship between frequency and wavelength in an electric circuit
The relationship between capacitance and inductance in an electric circuit
How is Ohm's law expressed mathematically?
V = IR
V = I/R
V = R/I
V = I + R
Calculate the current in a 110 V drill with 70 Ω resistance.
1.57 A
0.64 A
2.5 A
3.14 A
If a cooker has a 240 V supply and a current of 30 A, what is the resistance?
8 Ω
12 Ω
6 Ω
10 Ω
Calculate the voltage in a circulating pump with a resistance of 44 Ω and a current of 5 A.
220 V
200 V
240 V
180 V
What is the current in a 110 V drill with 70 ohms of resistance?
1.57 A
2.00 A
1.00 A
2.57 A
If a cooker has a 240 V supply and a current of 30 A, what is the resistance?
8 ohms
10 ohms
6 ohms
12 ohms
Calculate the voltage in a circulating pump with a resistance of 44 ohms and a current of 5 A.
220 V
200 V
240 V
180 V
What happens to the total resistance in a series circuit when resistors are connected one after the other?
It decreases
It remains the same
It is found by adding all the resistances together
It is found by multiplying all the resistances together
In a series circuit, how does the current behave through each resistor?
The current increases through each resistor
The current decreases through each resistor
The current remains the same through each resistor
The current varies randomly through each resistor
How does the voltage behave across each resistor in a series circuit?
The voltage is the same across each resistor
The voltage is different across each resistor
The voltage is zero across each resistor
The voltage doubles across each resistor
What is the total voltage in a series circuit with three resistors if the voltage across each resistor must equal the total circuit voltage?
The sum of the individual voltages
The average of the individual voltages
The highest individual voltage
The lowest individual voltage
According to Ohm's law, how can the voltage across each resistor in a series circuit be calculated?
By multiplying the current by the resistance
By dividing the resistance by the current
By adding the current and resistance
By subtracting the resistance from the current
In the given circuit, what is the current flowing through the resistors?
4 A
10 A
15 A
25 A
What is the total voltage across all resistors in the given circuit?
100 V
150 V
200 V
250 V
Using Ohm's law, what is the voltage across the 15Ω resistor?
40 V
60 V
80 V
100 V
According to Ohm's law, how is voltage (V) calculated?
V = I + R
V = I / R
V = IR
V = R / I
What happens to the supply voltage in a parallel circuit?
It increases with each resistor.
It decreases with each resistor.
It remains constant across all resistors.
It fluctuates randomly.
How is a voltmeter connected in a circuit?
In series with the load.
In parallel to the item being measured.
Directly to the power source.
In series with the power source.
What does an ammeter measure?
Voltage difference.
Small currents in series with the load.
Resistance in ohms.
Power in watts.
Which instrument measures ohms and requires the circuit to be disconnected?
Voltmeter
Ammeter
Ohmmeter
Wattmeter
What does a wattmeter measure?
Only voltage
Only current
Voltage and current to calculate power
Only resistance
