Electricity Flashcards

1
Q

What is a Hertz

A

how many times in a second the voltage alternates from + to – and back again

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2
Q

What frequency does the US typically use?

A

60Hz

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3
Q

What other frequency can commonly be found around the world

A

50Hz

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4
Q

What is Ohms Law

A

Voltage = Current * Resistance

V=IR

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5
Q

What is the definition of an Ohm

A

the resistance value through which one volt will maintain a current of one ampere.

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6
Q

What is resistance

A

how much current flows through a component.

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7
Q

Define Power

A

Power = Current * Voltage
P=IV
OR
P=I^2*R

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8
Q

Define Voltage

A

the difference in electrical

potential between two points in a circuit

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9
Q

Define Current

A

the time rate of flow of electric charge through an area

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10
Q

What are the characteristics of a grounding rod

A

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

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11
Q

What is bonding

A

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

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12
Q

1 horsepower = ? Watts

A

750

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