# Lesson 2 Quiz- Electricity And Electromotive Force

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• 1.

### ___________________ describes the opposition to the flow of electrons.

Explanation
Resistance is a term used to describe the opposition to the flow of electrons in a circuit. It is a property of a material that determines how easily or difficult it is for electric current to pass through it. Resistance is measured in ohms and is influenced by factors such as the length, cross-sectional area, and temperature of the material. A higher resistance means that there is more opposition to the flow of electrons, resulting in a lower current.

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• 2.

### Lightning is an example of ____________ electricity.

Explanation
Lightning is an example of static electricity because it is a sudden discharge of built-up electrical energy in the atmosphere. Static electricity occurs when there is an imbalance of electric charges on the surface of an object, causing a buildup of potential energy. In the case of lightning, this buildup occurs in the clouds due to the separation of positive and negative charges. When the electrical potential difference becomes too great, it results in a rapid flow of electrons, creating a lightning bolt.

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• 3.

### An example of an energy input into a generator is __________________.

Explanation
An example of an energy input into a generator is fossil fuels, such as coal, oil, or natural gas, which are burned to produce heat. This heat is then used to generate steam, which drives a turbine connected to a generator. Another example is falling water, also known as hydroelectric power, where the force of flowing or falling water is used to turn the turbine and generate electricity. Both fossil fuels and falling water are commonly used energy sources to provide the necessary input for generators to produce electricity.

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• 4.

### The _____________ causes an electric motorâ€™s magnetic field to collapse.

Explanation
The commutator is a crucial component in an electric motor that helps in reversing the direction of the current flowing through the motor's coils. When the commutator reverses the current, it causes the magnetic field generated by the motor to collapse. This collapsing magnetic field is necessary for the motor to continue rotating and generating mechanical energy.

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• 5.

### _____________________ is the quantity of electrons moving in a circuit (measured in amps).

Explanation
The correct answer is "current." Current refers to the quantity of electrons moving in a circuit, and it is measured in amps. Amperage is another term for current, so both terms are interchangeable in this context.

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• 6.

### The output of an electric motor is ___________________.

Explanation
The output of an electric motor is rotational force. When an electric current is passed through the motor's coils, it creates a magnetic field that interacts with the permanent magnets inside the motor. This interaction produces a rotational force, which is then used to drive the motor's shaft and perform mechanical work. This rotational force is what allows the motor to power various devices and machinery.

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• 7.

### The electricity we get from batteries and generators is called _______________ electricity.

Explanation
The electricity we get from batteries and generators is called "current" because current refers to the flow of electric charge in a circuit. Batteries and generators produce a continuous flow of electric charge, which is known as electric current.

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• 8.

### ____________________ is an electrical circuit that allows only one path for current flow.

Explanation
A series circuit is an electrical circuit that allows only one path for current flow. In a series circuit, the components are connected end-to-end, meaning that the current flows through one component before passing through the next. This creates a continuous loop for the current to flow through, with no alternate paths. As a result, the current in a series circuit is the same throughout all the components, and if one component fails or is removed, the circuit is broken and no current can flow. Therefore, a series circuit allows only one path for current flow.

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• 9.

### ___________________ is the output for a generator.

Explanation
A generator is a device that converts mechanical energy into electrical energy. Therefore, the output for a generator is electricity.

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• 10.

### Resistance is measured in _____________.

Explanation
Resistance is a property of an electrical component or material that opposes the flow of electric current. It is measured in ohms, which is the unit of electrical resistance. Ohms is derived from the name of the German physicist Georg Simon Ohm, who formulated Ohm's Law that describes the relationship between voltage, current, and resistance in an electrical circuit. Therefore, the correct answer to the question is ohms.

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• 11.

### In an electric motor, opposing magnetic fields cause the ________________ to turn.

Explanation
In an electric motor, the armature is a key component that rotates due to the opposing magnetic fields. The armature is a coil of wire that is connected to a power source and placed in between the permanent magnets. When an electric current flows through the armature, it creates a magnetic field that interacts with the magnetic field of the permanent magnets, causing the armature to rotate. This rotation is what drives the motor and allows it to perform its intended function.

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• 12.

### Your local power company provides ________________________ electricity.

Explanation
Your local power company provides current electricity, specifically alternating current (AC), which is generated to supply power to homes and businesses.

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• 13.

### __________________ is an electrical circuit that allows multiple paths for current flow.

Explanation
A parallel circuit is an electrical circuit that allows multiple paths for current flow. In a parallel circuit, the components are connected side by side, creating separate branches for the current to flow through. This arrangement ensures that if one component fails or is removed, the current can still flow through the other branches. This is in contrast to a series circuit, where the components are connected in a single path, and if one component fails, the entire circuit is interrupted. In a parallel circuit, the voltage across each component remains the same, while the current is divided between the branches based on their resistance.

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• 14.

### "Electrons moving through a conductor" is another description for _________________.

Explanation
The given correct answer is "electricity". This is because electrons moving through a conductor is a fundamental concept in the study of electricity. When electrons flow through a conductor, it creates an electric current, which is the movement of electric charge. Therefore, "electrons moving through a conductor" is a description that directly relates to the concept of electricity.

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• 15.

### The push of electrons (potential difference) is also called ____________________.

Explanation
The push of electrons, also known as potential difference, is commonly referred to as voltage. Voltage is a measure of the electric potential energy per unit charge in a circuit, indicating the force that drives the flow of electrons. It is measured in volts and is a fundamental concept in understanding electrical circuits and devices.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Nov 10, 2009
Quiz Created by
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