Week 30 - Power

Question 1

What are voltage rating categories, their voltages, their risk factors, and their common applications?

Answer 1

Extra low voltage:
Under 50v
Low risk
Audio signal (line voltage)

Low voltage:

50V to 1000V
Electrical shock
Household voltage, industrial voltage, venue mains

High Voltage:

Over 1000v
Electrical Arcing
Power plant generation, long distance transmission

Question 2

What is an electrical ground?

Answer 2

Provides a path for the electricity to flow if there is a fault in the equipment, causing a surge

A connection made to a pipe or plate that is buried in the ground

Water pipes make an excellent ground connections

Question 3

Where are some places we would measure resistance?

Answer 3

Speakers
Components (Resistors, Faders)
Cables
Adaptors

Question 4

What do voltage readings on a battery tell us?

Answer 4

AA and AAA:

1. 5 Volts is “new”
2. 2 Volts is “used but good”
3. 1 Volts or less is “Dead”

9V:

9 Volts is “new”
8 Volts is “Used but good”
7 Volts or less is “Dead”

Question 5

What are tamper resistant duplexes and why are they in use?

Answer 5

Electrical code (since 2008) Now requires that all duplexes be “Tamper resistant”

The hot and neutral connections have a gate over them that will only open if equal force is applied to both sides at the same time