AC Quiz: Test Your Knowledge on AC Electricity

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Questions and Answers

What is the frequency of the alternating current in most countries?

40 Hz

60 Hz (correct)

70 Hz

50 Hz

What does AC stand for in the context of electricity?

Alternating Charge

Active Current

Amperage Control

Alternating Current (correct)

What is the unit of frequency for a waveform?

Watt (W)

Ampere (A)

Hertz (Hz) (correct)

Volt (V)

What is the time taken for an alternating quantity to complete one cycle called?

Period Signup and view all the answers

What is the waveform of AC described as in the text?

Sine wave Signup and view all the answers

What are the instantaneous values of an alternating current?

Values at any instant of time Signup and view all the answers

What is the relationship between the period and frequency of a wave?

$T = \frac{1}{F}$ Signup and view all the answers

What is the power mains electricity in most countries primarily delivered as?

Alternating current (AC) Signup and view all the answers

What type of power do servers have?

Power supplies and modules of varying sizes and technologies Signup and view all the answers

What is the advantage of AC, as mentioned in the text?

It has several important advantages Signup and view all the answers

What is the variation of voltage with time for an alternating current described as in the text?

Figure 2. Variation of voltage with time for an alternating current Signup and view all the answers

What is the unit of the period of a waveform?

Milliseconds (mS) Signup and view all the answers

What does a power supply do?

Converts line voltage AC power to low-voltage DC power for system components Signup and view all the answers

What is the difference between single-phase and three-phase power?

Single-phase power refers to a two-wire AC power circuit, while three-phase power refers to a three-wire AC power circuit with three separate voltages Signup and view all the answers

What does a NEMA 5-15P plug represent?

3-Wire 125V, 15 amp plug Signup and view all the answers

What is the advantage of a server power supply that operates directly from 480/277V power distribution circuits?

Reduces the total cost of ownership for high-power demand systems Signup and view all the answers

What is the function of a NEMA straight blade plug?

Carries unique pin positions based upon amperage and voltage Signup and view all the answers

What are the components of a three-wire service supplied to residences and cottages?

Two live conductors and one neutral conductor Signup and view all the answers

What is the difference between single-phase and three-phase voltages?

Three-phase voltage is 1.73 times more than single-phase voltage Signup and view all the answers

What is the significance of the numbers in NEMA designations?

The numbers before the dash represent voltage and wires, and the numbers after the dash represent amperage Signup and view all the answers

What is the purpose of planning for system electrical service?

To determine the server's plug and receptacle type for proper outlets installation Signup and view all the answers

What are the power requirements for server and network equipment in Canada?

NEMA 5-15P standard plugs or NEMA 5-20P standard plugs Signup and view all the answers

Study Notes

Alternating Current (AC)

The frequency of AC in most countries is 50-60 Hz.
AC stands for Alternating Current in the context of electricity.

Frequency and Period

The unit of frequency for a waveform is Hertz (Hz).
The time taken for an alternating quantity to complete one cycle is called the period.

Waveform and Values

The waveform of AC is described as sinusoidal.
The instantaneous values of an alternating current are constantly changing.

Relationship between Period and Frequency

The period and frequency of a wave are inversely proportional.

Power Delivery

Power mains electricity in most countries is primarily delivered as AC.
Servers typically have AC power.

Advantage of AC

The advantage of AC is that it is easier to transmit over long distances with less energy loss.

Voltage Variation

The variation of voltage with time for an alternating current is described as a sine wave.

Period Unit

The unit of the period of a waveform is seconds (s).

Power Supply

A power supply converts AC power from the mains to a stable DC power for use by electronic devices.

Single-Phase and Three-Phase Power

Single-phase power is used for low-power devices and has one live wire and one neutral wire.
Three-phase power is used for high-power devices and has three live wires and one neutral wire.
A NEMA 5-15P plug represents a single-phase power plug.

Server Power Supply

The advantage of a server power supply that operates directly from 480/277V power distribution circuits is that it reduces the need for transformers.

NEMA Straight Blade Plug

The function of a NEMA straight blade plug is to provide a safe and reliable connection to a power source.

Three-Wire Service

The components of a three-wire service supplied to residences and cottages are one live wire, one neutral wire, and one grounding wire.

Voltage Difference

The difference between single-phase and three-phase voltages is the number of live wires and the voltage rating.

NEMA Designations

The numbers in NEMA designations represent the voltage and current ratings of the plug or socket.

System Electrical Service

The purpose of planning for system electrical service is to ensure that the electrical system can meet the power requirements of the equipment.

Power Requirements

The power requirements for server and network equipment in Canada vary depending on the type and quantity of equipment.

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Description

Test your knowledge of alternating current (AC) electricity with this quiz. Learn about the characteristics and advantages of AC, and its use in power mains in different countries.

AC Electricity Quiz