Chapter 1

What was primarily a scientific curiosity at the beginning of the nineteenth century and became a vital foundation of modern technology by the end of the twentieth century?

• The electric telegraph

• The steam engine

• The telephone

• The internet

Answer explanation

The electric telegraph was primarily a scientific curiosity in the 19th century and became a vital foundation of modern technology by the 20th century. It revolutionized communication and paved the way for modern telecommunication systems.

According to the introduction, for what purposes do we need energy?

• To heat, cool, and light our homes and run appliances, vehicles, and industrial machinery

• To power our smartphones and computers only

• To operate televisions and radios

• To cook food outdoors

Answer explanation

Energy is needed to heat, cool, and light our homes, run appliances, vehicles, and industrial machinery.

What must we first understand to work effectively with electrical technology?

• The basic principles that govern electric circuits

• How to use a calculator

• The history of electricity

• The different types of batteries

Answer explanation

To work effectively with electrical technology, we must first understand the basic principles that govern electric circuits. This knowledge is essential for troubleshooting and designing electrical systems.

What is the base unit of temperature in the International System of Units (SI)?

• Ampere

• Kelvin

• Kilogram

• Metre

Answer explanation

The base unit of temperature in the International System of Units (SI) is Kelvin. It is the correct choice for measuring temperature accurately.

Which of the following is a learning outcome for the chapter?

• Understanding the schematic diagram of a simple electric circuit

• Memorizing the periodic table of elements

• Calculating the speed of light in a vacuum

• Writing chemical formulas for compounds

Answer explanation

The learning outcome for the chapter is understanding the schematic diagram of a simple electric circuit.

What notation is used to represent very large or very small quantities in this chapter?

• Fractional notation

• Decimal notation

• Scientific notation

• Integer notation

Answer explanation

Scientific notation is used to represent very large or very small quantities in this chapter.

What is the purpose of dimensional analysis as mentioned in the learning outcomes?

• To understand the dimensions of physical objects

• To convert from one system of units to another

• To analyze the dimensions of a room

• To calculate the dimensions of a circuit board

Answer explanation

Dimensional analysis is used to convert from one system of units to another.

What does the term 'electricity' refer to according to the text?

• A type of energy that can only be used in circuits

• A flow of charged particles or the branch of physics dealing with such flows

• The process of converting chemical energy into light and heat

• The graphical representation of electric circuits

Answer explanation

According to the text, 'electricity' refers to a flow of charged particles or the branch of physics dealing with such flows.

What is the role of a 'load' in a circuit?

• To interrupt the transmission of electric energy

• To store chemical energy

• To convert electric energy to some other form of energy

• To represent the circuit in a schematic diagram

Answer explanation

The role of a 'load' in a circuit is to convert electric energy to some other form of energy.

What is the purpose of a switch in an electric circuit as described in the text?

• To store electric energy

• To convert electric energy to light and heat

• To start and stop the energy conversion at will

• To convey electric energy to the lamp

Answer explanation

The purpose of a switch in an electric circuit is to start and stop the energy conversion at will.