Flashcards in Ohmers Law Deck (20):

1

## Ohms Law

###
V=IR

Voltage =current x resistance (impedance)

2

## Define voltage

### Electromotive force or the force that drives electron flow

3

## Define current

### Flow of electrons

4

## Define resistance

### Resistance to current flow measured in ohms=impedance

5

## Furmans formula

###
E=IR

E represents electromotive force

6

## Define series

### Beginning of one resistance is connected to the end of another

7

## Formula for sum of resistances

### R1+R2=total resistance

8

## What type of lead issue does series resistance issue indicate ?

### Lead fracture or loose set screw (increased impedences)

9

## State how to determine voltage drop across a resistance

### Determine the ratio of R1 to R2 to determine the percentage drop across each point

10

## When are resistances said to be in parallel?

### Resistances are said to be in parallel when ALL resistances are connected to the SAME point

11

## List the formula for parallel resistances

### R1 x R2/R1+R2

12

## Give an example of resistances in parallel

### Lead insulation defect (low impedance)

13

## Does a lead fracture cause an increase or decrease in impedance?

### INCREASE in impedance

14

## Does a lead insulation defect cause an increase or decrease in impedance?

### DECREASE

15

## List normal lead impedance

### 400-600 ohms

16

## Do PPMs use constant voltage or current?

###
Constant voltage ppm

Constant current for most temp pacers but some are constant voltage

17

## To what does the term Load refer?

### Impedance or resistance applied to a circuit

18

## Is a system with a small load applied to a circuit considered constant current or constant voltage?

### Constant current

19

## Is a system with a large load considered to be a constant current or constant voltage device?

### Constant voltage

20