Science 1 Marks Question

Case (a): The Lamp will glow.
Case (b): Lamp will not glow.
Case (c): Lamp may not glow if the battery is reversed.
Case (d): Lamps will glow.

To prevent the lamp from lighting in Fig., connect an insulator (like rubber or plastic) between A and B. This will break the circuit and stop the flow of electricity.

LED/Bulb

Insulator

Copper

Closed circuit

Switch

Filament

Battery

Electric cell

No, the bulb does not glow when the circuit is open.

An open circuit means the switch is in the ‘OFF’ position, interrupting the flow of current.

A closed circuit means the switch is in the ‘ON’ position, and the current can flow through the circuit.

The positive terminal of one cell is connected to the negative terminal of the next cell to prepare a battery.

When two or more cells are joined together, it is called a battery.

The longer line represents the positive terminal, and the shorter line represents the negative terminal of the battery.

The symbol of a battery consists of two or more cells connected in series.

A key can be placed anywhere in the circuit.

Battery, wire, key, and bulb are the components of a simple electric circuit.

The path through which electric charges move from one point to another is called an electric circuit.

Observation and conclusion: The circuit diagram can be drawn easily with the help of symbols of different electric components.

Observation and conclusion: By connecting the switch to a battery and lamp, we saw that the lamp glows only when the safety by opening or closing the path.

Observation and conclusion: We constructed a simple switch using a safety pin and drawing pins on a cardboard piece. When connected with wires, this setup works as a basic switch that can open or close a circuit.

Fig. (a) An electric lamp holder with wires attached
(b) An incandescent lamp inside the lamp holder
(c) Wires connected to incandescent torch lamp with electrical tape

Fig. (a) An electric cell holder with two wires attached
(b) An electric cell inside the cell holder
(c) Wires connected to an electric cell using electrical tape

Yes, in a torch, cells are usually placed in series. The positive terminal of one cell is connected to the negative terminal of the next. This arrangement increases the total voltage, which powers the lamp.

When electricity passes through the filament, it gets very hot. This heat causes the filament to glow, producing light.

The positive (+) terminal of the cell should be connected to the longer wire of the LED.

A cell holder helps to connect and hold the cell properly in a circuit. 

The component that connects or breaks the flow of electricity in a circuit is called a switch.