1.
A __________ is a closed path or loop around which an electric current flows.
Correct Answer
A. Circuit
Explanation
A circuit is a closed path or loop through which an electric current can flow. It is made up of various components such as wires, resistors, capacitors, and switches. When a voltage source, such as a battery, is connected to a circuit, it creates a potential difference that drives the flow of electrons. The electrons move through the circuit, following the path provided by the wires, and can perform various tasks such as powering electronic devices or generating light. Therefore, a circuit is essential for the flow of electric current.
2.
In a ____________ the switch is closed and electric current flows from the source through the connection device.
Correct Answer
C. Closed circuit
Explanation
In a closed circuit, the switch is closed, allowing electric current to flow from the source through the connection device. This means that there is a complete and uninterrupted path for the current to follow, enabling the flow of electricity.
3.
A _____________ was the source of electricity in the labs that we did.
Correct Answer
B. Battery
Explanation
A battery is a device that stores chemical energy and converts it into electrical energy. In the context of the labs mentioned, a battery would be the most suitable source of electricity as it can provide a steady and reliable flow of electrical energy to power the experiments or equipment being used. A light bulb is a device that converts electrical energy into light energy, and a wire is a conductor that allows the flow of electricity, but neither of these options would serve as the primary source of electricity in the labs.
4.
Benjamin Franklin was credited with inventing the light bulb.
Correct Answer
B. False
Explanation
Benjamin Franklin did not invent the light bulb. The credit for inventing the light bulb goes to Thomas Edison. Benjamin Franklin was a renowned American polymath and inventor, but his notable inventions include the lightning rod, bifocals, and the Franklin stove, not the light bulb.
5.
________ conducts electricity.
Correct Answer
B. Wire
Explanation
Wire conducts electricity because it is made of a material, such as copper or aluminum, that has free electrons. These free electrons are able to move easily through the wire, creating a flow of electric current. In contrast, light bulbs and batteries do not conduct electricity in the same way. Light bulbs convert electrical energy into light, while batteries store and release electrical energy.
6.
Current electricity is a type of electricity where electrons move from one place to another through an electric circuit.
Correct Answer
A. True
Explanation
Current electricity is indeed a type of electricity where electrons move from one place to another through an electric current. This means that in current electricity, there is a flow of charged particles (electrons) in a circuit, which allows for the transfer of energy and the powering of electrical devices. Therefore, the statement "Current electricity is a type of electricity where electrons move from one place to another through an electric current" is true.
7.
A ___________________ is the object that changes electrical energy into light energy.
Correct Answer
A. Light bulb
Explanation
A light bulb is the object that changes electrical energy into light energy. When an electrical current passes through the filament in the light bulb, it becomes hot and emits light. This process is known as incandescence. Light bulbs are designed to convert electrical energy into light energy efficiently, making them a commonly used source of illumination in various applications.
8.
There are four places that must be connected on the battery and bulb in order for the bulb to light.
Correct Answer
A. True
Explanation
In order for the bulb to light, it is necessary to have a complete circuit. This means that all four places on the battery and bulb must be connected. If any of these connections are missing or broken, the circuit will be incomplete and the bulb will not light up. Therefore, the statement is true.