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Chapter 13: Problem 3

The device used for producing electric current is called a (a) generator. (b) galvanometer. (c) ammeter. (d) motor.

Short Answer

Expert verified
The correct answer is (a) generator.

Step by step solution

01

Understand the Definitions

Review the definitions of each device: a generator, galvanometer, ammeter, and motor, to understand their functions.
02

Define Generator

A generator is a device that converts mechanical energy into electrical energy to produce an electric current.
03

Define Galvanometer

A galvanometer is an instrument for detecting and measuring small electric currents.
04

Define Ammeter

An ammeter is an instrument for measuring electric current in amperes.
05

Define Motor

A motor is a device that converts electric energy into mechanical energy.
06

Identify the Correct Option

Compare the definitions and identify that a generator is the device specifically used for producing electric current.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

generator
A generator is a crucial device in the field of electricity generation. It converts mechanical energy into electrical energy, thus producing an electric current.
There are different types of generators, including:
  • AC Generator: Produces alternating current (AC), where the flow of electrons changes direction periodically.
  • DC Generator: Produces direct current (DC), where the flow of electrons is in a single direction.
Generators are widely used in power plants, automotive industries, and emergency power backup systems.
In essence, without generators, we would struggle to provide power for homes, offices, and various industries.
galvanometer
A galvanometer is an instrument used to detect and measure small electric currents. It works by measuring the deflection of a needle or pointer in response to electric current flowing through a coil in a magnetic field.
Key points about galvanometers:
  • They can measure very small currents with high precision.
  • Commonly used in experiments and laboratory settings to measure small currents and circuit analysis.
  • Not typically used in large-scale power systems due to their sensitivity.
The main components of a galvanometer include a coil of wire, a permanent magnet, and a needle or pointer.
This instrument is essential for understanding and analyzing the behavior of electric circuits at a very granular level.
ammeter
An ammeter is a device used to measure electric current in a circuit. It is connected in series with the circuit, ensuring that all the current flows through the ammeter.
Important aspects of ammeters:
  • They measure current in amperes (A).
  • Designed to have very low resistance to minimize voltage drop and power loss.
  • Commonly found in both analog and digital forms.
There are different types of ammeters, such as analog ammeters that use a moving needle and digital ammeters that provide a numerical display.
Ammeter readings are essential for diagnosing electrical issues, monitoring system performance, and ensuring safe operation of electrical systems.
motor
A motor is a device that converts electrical energy into mechanical energy. This transformation is crucial for powering countless devices from household appliances to industrial machinery.
Essential points about motors:
  • AC Motors: Operate on alternating current (AC) and are commonly used in household appliances and larger industrial machines.
  • DC Motors: Operate on direct current (DC) and are often found in battery-powered devices.
The basic components of a motor include a stator (stationary part), rotor (rotating part), and a commutator or brushes in some types.
Motors play a vital role in modern society by enabling movement and operational functionality in myriad electronic devices and systems.

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Most popular questions from this chapter

A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil?

Which of the following correctly describes the magnetic field near a long straight wire? (a) The field consists of straight lines perpendicular to the wire. (b) The field consists of straight lines parallel to the wire. (c) The field consists of radial lines originating from the wire. (d) The field consists of concentric circles centred on the wire.

When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

The essential difference between an AC generator and a DC generator is that (a) AC generator has an electromagnet while a DC generator has permanent magnet. (b) DC generator will generate a higher voltage. (c) AC generator will generate a higher voltage. (d) AC generator has slip rings while the DC generator has a commutator.
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