AC Electricity Quiz

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.