open circuit and close circuit online exercise for - Free Printable

Problem Analysis:

The task involves determining whether the bulb(s) in each circuit will light up or not, and providing a reason for each answer. To solve this, we need to understand the basic principles of electrical circuits:

1. Closed Circuit: A closed circuit is a complete loop where electricity can flow from the power source (e.g., battery) through the components (e.g., bulb) and back to the power source. In a closed circuit, the bulb will light up.
2. Open Circuit: An open circuit is one where the loop is broken, meaning there is no continuous path for electricity to flow. In an open circuit, the bulb will not light up.

Solution:

#### Circuit 1:
- Description: The circuit consists of a single bulb connected to a wire that forms a loop but does not have a power source (battery).
- Analysis: Since there is no power source (battery) in the circuit, there is no electricity flowing through the bulb. The circuit is incomplete (open).
- Answer:
- The bulb does not light up.
- Reason: There is no power source (battery) to provide electricity, so the circuit is open.

#### Circuit 2:
- Description: The circuit consists of a bulb and a battery connected by wires, forming a complete loop.
- Analysis: The circuit is complete because the battery provides a power source, and the wires connect the battery to the bulb and back, forming a closed loop. Electricity can flow through the bulb.
- Answer:
- The bulb lights up.
- Reason: The circuit is closed, with a complete path for electricity to flow from the battery through the bulb and back to the battery.

#### Circuit 3:
- Description: The circuit consists of a bulb and a battery, but the wires are not connected properly. One end of the wire is disconnected from the battery.
- Analysis: The circuit is incomplete because there is a break in the connection between the battery and the bulb. This means there is no continuous path for electricity to flow.
- Answer:
- The bulb does not light up.
- Reason: The circuit is open due to the disconnected wire, preventing electricity from flowing through the bulb.

Final Answers:

1. The bulb does not light up.
- Reason: There is no power source (battery), so the circuit is open.

2. The bulb lights up.
- Reason: The circuit is closed, with a complete path for electricity to flow.

3. The bulb does not light up.
- Reason: The circuit is open due to the disconnected wire.

Boxed Final Answer:

\[
\boxed{
\begin{array}{ll}
\text{1. The bulb does not light up.} & \text{Reason: No power source (battery), so the circuit is open.} \\
\text{2. The bulb lights up.} & \text{Reason: The circuit is closed, with a complete path for electricity to flow.} \\
\text{3. The bulb does not light up.} & \text{Reason: The circuit is open due to the disconnected wire.} \\
\end{array}
}
\]