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WorksheetsElectronics (For HBL 19 July 2022)
Total questions: 14
Worksheet time: 16mins
In a electrical wire, it contains materials that are either conductors or insulators.
Which of the following materials do you think is most likely used to conduct electricity in a wire?
Gold
Steel
Copper
Graphite
Now you see your friend lying on the floor - unconscious. He is grabbing on to an exposed electrical wire and you do not have the time to search for the emergency electrical cut-off switch.
You have to find a way to remove the wire from his hands. You look around you and you see the following:
A metal ruler
A pail of water (To wake him up?)
A metallic-looking rod (it looks plastic)
and a wooden broom.
Which would you use?
Metal ruler
Pail of water (to wake him up)
Metallic-looking rod
Wooden broom
The video on the left shows wires being soldered on to a circuit board. The process of soldering is to ensure electronic components like wires are joined together to ensure they do not move out of place.
Do you think that the material (the solder) used to join the wire in place are conductors or insulators?
Conductor,
since need to ensure that electricity is able to continue flowing from the wire to the circuit board.
Insulator,
so that the user is not accidentally electrocuted from the exposed wire.
This is André-Marie _____.
He is the French physicist who founded and named the science of electrodynamics, now known as electromagnetism.
He also gives his name to the measurement of electrical current. What is his last name (in blank above)?
Ohm
Ampère
Volta
Faraday
Arrange the following battery sizes from smallest to largest.
What symbol was used to inform the potential difference in the battery??
A
V
It was never indicated. Trick question.
What is the purpose of switches?
To direct the electrical current to another circuit.
To open or close an electrical circuit.
To allow a switch of electrical component.
To increase or decrease the electrical current within the circuit.
Match the following switches to its names.
Toggle switch
Rocker switch
Push button switch
Slide switch
Reed switch
Picture on the left shows an LED. What is an LED?
Light Emitting Dots
Little Emitting Diode
Light Emitting Diode
Light Emergency Device
Which of the following is true comparing LED and light bulbs?
(See photo on left for an example of a light bulb)?
LEDs are more efficient than light bulbs.
LEDs emit lesser heat than light bulbs
LEDs can last longer than light bulbs
LEDs are easier to replace when blown.
LEDs are generally more environmentally friendly than light bulbs.
Match the following electrical circuit symbols.
LED
Light bulb
Resistor
Battery
Switch
One advantage of light bulb over LEDs is that there is no polarity on light bulbs. This means that the light bulb works as long as the circuit is connected to the bulb's contact and cap.
True
False
An LED can only work with very low voltage in the circuit. Therefore it needs an electrical component to reduce voltage.
Which of the of following components will be best suited?
A switch
One more LED
A voltmeter
A resistor
Now if you have paid attention in my previous explanation, which of the following on an LED is the positive lead?
Longer lead
Shorter lead
