Ls 12 Pt.1 Flashcards
Who was Benjamin Franklin?
American printer, journalist, scientist, and statesman (1706-1790)
Known for his contributions to electricity and invention of the lightning rod.
What is the filament in a bulb?
A thin spring-like wire inside the bulb that glows when electricity passes through it
The filament is typically made of tungsten.
What is the main difference between a torch bulb and an electric bulb?
The structure and the electrical connections
Torch bulbs are usually simpler and designed for portable use.
What do electric bulbs require for operation?
A complete path for electricity to flow
This requires a circuit that includes a power source, a bulb, and connecting wires.
What happens when the switch is ON in an electric circuit?
The circuit provides electricity to the terminals of the bulb
This allows the bulb to glow.
What are the two protruding parts of an electric bulb called?
Terminals
These connect to the power source.
What is the role of the metal cap in a bulb?
It holds the glass chamber and connects to the terminals
The metal cap is crucial for establishing electrical connections.
Fill in the blank: An electric circuit consists of a cell (power source), a ______, and connecting wires.
bulb
What is the function of a cell in an electric circuit?
To provide electrical energy
The cell has a positive and negative terminal for current flow.
True or False: The bulb glows only when there is a closed path for electricity.
True
What do the signs (+) and (-) on a cell indicate?
The positive and negative terminals
These signs help in connecting the cell correctly in a circuit.
What should be avoided when connecting wires to a cell?
Connecting the two terminals directly without a load
This can short-circuit the cell.
How should wires be prepared for connecting to a bulb?
Remove the plastic covering from both ends and strip about two centimeters
This ensures proper connection to the terminals.
What materials are typically used for electric wires?
Copper with plastic insulation
Copper is a good conductor of electricity.
Fill in the blank: The top part of the cell with protrusion is the ______ terminal.
positive
What happens in Fig. 4(b) and Fig. 4(c) regarding the electric circuit?
There is no closed path for the flow of electric current
Incomplete circuits do not allow bulbs to glow.
What is the purpose of the bulb glowing in an electric circuit?
To indicate that electricity is flowing through the circuit
A glowing bulb shows a complete circuit.
