Electricity Flashcards
What is a Hertz
how many times in a second the voltage alternates from + to – and back again
What frequency does the US typically use?
60Hz
What other frequency can commonly be found around the world
50Hz
What is Ohms Law
Voltage = Current * Resistance
V=IR
What is the definition of an Ohm
the resistance value through which one volt will maintain a current of one ampere.
What is resistance
how much current flows through a component.
Define Power
Power = Current * Voltage
P=IV
OR
P=I^2*R
Define Voltage
the difference in electrical
potential between two points in a circuit
Define Current
the time rate of flow of electric charge through an area
What are the characteristics of a grounding rod
Grounding rod (copper clad steel)
• Must be 1⁄2 diameter
• Installed below permanent moisture level
• Must be no less than 8’ in length
• Must be in ground at least 8’
• Drive so upper end is flush with ground
What is bonding
the permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed
1 horsepower = ? Watts
750
