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WorksheetsSnap Circuits 3
Total questions: 20
Worksheet time: 10mins
What is the unit of electrical resistance?
ampere
ohm
watt
volt
The purpose of a resistor in an electrical circuit is to limit the flow of current and control voltage levels.
True
False
The main difference between a parallel and series circuit is the way the components are connected and how the current flows through them.
True
False
The relationship between voltage, current, and resistance in a circuit is given by Ohm's law: V = I * R.
True
False
How does an LED (Light Emitting Diode) work?
LEDs work by absorbing light when an electric current passes through them.
LEDs work by producing sound when an electric current passes through them.
LEDs work by generating heat when an electric current passes through them.
LEDs work by emitting light when an electric current passes through them.
Which unit is used to measure electrical resistance?
volt (V)
ohm (Ω)
ampere (A)
joule (J)
Ohm's law is given by the formula V = IR, which means the voltage in a circuit is equal to the product of the current and the resistance.
True
False
What happens to the total resistance in a parallel circuit as more resistors are added?
Total resistance becomes negative
Total resistance remains the same
Total resistance decreases
Total resistance increases
The current flows through each resistor in sequence, with the same value of current passing through each one.
True
False
What are the safety precautions to be taken when working with electricity?
Working with electricity in wet conditions
Ignoring warning signs or labels
Wearing appropriate PPE, ensuring proper grounding, using insulated tools, and being cautious around live wires or electrical panels.
Using damaged or frayed electrical cords
What role does a diode play in an electrical circuit?
To allow current to flow in both directions equally
To stop the flow of current entirely
To convert AC current to DC current
To allow current to flow in only one direction
Why is grounding important in electrical systems?
To increase the efficiency of the circuit
To provide a path for electrical current to flow back to the source in case of a fault
To convert AC to DC
To store excess electricity
Which of the following is a characteristic of a series circuit?
If one component fails, the entire circuit stops working.
The voltage across each component is the same.
The total resistance is less than the smallest resistor in the circuit.
Adding more components will decrease the overall current.
Which device is used to measure electric current?
Voltmeter
Ammeter
Ohmmeter
Wattmeter
What is the primary function of a fuse in an electrical circuit?
To increase the current flow
To measure the current flowing through the circuit
To prevent overloading by breaking the circuit if the current exceeds a certain threshold
To store electrical energy for later use
Which material is commonly used as a conductor in electrical circuits?
Plastic
Wood
Copper
Rubber
What effect does adding more resistors in series have on the total resistance of a circuit?
The total resistance decreases
The total resistance remains the same
The total resistance increases
The total resistance becomes negative
Which of the following is a property of an ideal insulator?
High thermal conductivity
Low electrical resistance
High electrical resistance
Ability to conduct magnetic fields
What happens to the brightness of bulbs in a series circuit if more bulbs are added?
The brightness of all bulbs increases
The brightness of all bulbs remains the same
The brightness of all bulbs decreases
Only the newly added bulbs will light up
What is the effect of increasing the voltage in a circuit while keeping the resistance constant?
The current decreases
The current remains the same
The current increases
The circuit becomes an open circuit
