Flashcards in Electricity Deck (12)

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1

## What is a Hertz

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

2

## What frequency does the US typically use?

### 60Hz

3

## What other frequency can commonly be found around the world

### 50Hz

4

## What is Ohms Law

###
Voltage = Current * Resistance

V=IR

5

## What is the definition of an Ohm

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

6

## What is resistance

### how much current flows through a component.

7

## Define Power

###
Power = Current * Voltage

P=IV

OR

P=I^2*R

8

## Define Voltage

###
the difference in electrical

potential between two points in a circuit

9

## Define Current

### the time rate of flow of electric charge through an area

10

## 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

11

## 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

12