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WorksheetsSimple LED Circuit Quiz
Total questions: 20
Worksheet time: 10mins
What is the main job of a battery in a circuit?
To provide power
To light up
To connect components
To block electricity
Which component is used to turn a circuit on and off?
A switch
A resistor
A battery
An LED
What does LED stand for?
Light Emitting Diode
Low Energy Device
Liquid Electronic Display
Laser Emitting Diode
Why is a resistor important to use with an LED?
To protect the LED from burning out
To make the LED brighter
To store extra power
To act as a switch
What is a breadboard used for in robotics projects?
For prototyping and testing circuits
To cut wires to the right length
As the main power source
To write the code for the robot
An LED has two legs, a longer one and a shorter one. What is the longer leg called?
Anode (+)
Cathode (-)
Resistor
Switch
What is the main function of a capacitor in a circuit?
To store electrical energy
To create light
To resist the flow of electricity
To permanently stop the current
If you build a circuit and the LED does not light up, what is the first thing you should check?
If all the components are connected correctly
If the resistor has the right color code
If the capacitor is large enough
If the breadboard is clean
What do we call a path that allows electricity to flow from the battery, through the components, and back to the battery?
A closed circuit
An open circuit
A short circuit
A breadboard circuit
On a breadboard, the long rows at the top and bottom, marked with '+' and '-', are called what?
Power rails
Component rows
The central divider
Switching lines
If a switch is 'open', what does this mean for the circuit?
The circuit is broken and electricity cannot flow.
The circuit is complete and electricity can flow.
The battery is charging.
The resistor is working at maximum power.
Which of these components has polarity, meaning it must be connected in the correct direction?
LED
Resistor
Switch
Breadboard
What is the unit of measurement for resistance?
Ohms (Ω)
Volts (V)
Amps (A)
Watts (W)
In a standard breadboard, how are the holes in the central section connected?
In short, horizontal rows of 5
In long, vertical columns
All the holes are connected together
None of the holes are connected
What happens to the energy stored in a capacitor when it is disconnected from the battery and connected to an LED?
It discharges, briefly lighting up the LED
It disappears
It goes back into the battery
It stays in the capacitor forever
Which component's primary role is to introduce a specific amount of opposition to the flow of current?
Resistor
Capacitor
Battery
Switch
A 'short circuit' is dangerous because:
Too much current flows, which can overheat the battery and wires
It makes the LED light up too brightly
It stops the flow of electricity
It drains the capacitor too slowly
For a simple school project, what is the safest type of battery to use?
A 9-volt or AA batteries
A car battery
Plugging wires directly into a wall outlet
A mobile phone battery
What is the flow of tiny particles called electrons in a circuit?
Current
Voltage
Resistance
Capacitance
When you finish your robotics project, why is it a good idea to disconnect the battery?
To prevent the battery from draining and for safety
To make the LED glow brighter next time
To reset the breadboard
To cool down the resistor
