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IBHRE Exam > Ohmers Law > Flashcards

Ohmers Law Flashcards

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1
Q

Ohms Law

A

V=IR

Voltage =current x resistance (impedance)

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2
Q

Define voltage

A

Electromotive force or the force that drives electron flow

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3
Q

Define current

A

Flow of electrons

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4
Q

Define resistance

A

Resistance to current flow measured in ohms=impedance

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5
Q

Furmans formula

A

E=IR

E represents electromotive force

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6
Q

Define series

A

Beginning of one resistance is connected to the end of another

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7
Q

Formula for sum of resistances

A

R1+R2=total resistance

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8
Q

What type of lead issue does series resistance issue indicate ?

A

Lead fracture or loose set screw (increased impedences)

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9
Q

State how to determine voltage drop across a resistance

A

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

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10
Q

When are resistances said to be in parallel?

A

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

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11
Q

List the formula for parallel resistances

A

R1 x R2/R1+R2

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12
Q

Give an example of resistances in parallel

A

Lead insulation defect (low impedance)

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13
Q

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

A

INCREASE in impedance

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14
Q

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

A

DECREASE

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15
Q

List normal lead impedance

A

400-600 ohms

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16
Q

Do PPMs use constant voltage or current?

A

Constant voltage ppm

Constant current for most temp pacers but some are constant voltage

17
Q

To what does the term Load refer?

A

Impedance or resistance applied to a circuit

18
Q

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

A

Constant current

19
Q

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

A

Constant voltage

20
Q

Give an example of series resistance defect

A

Lead fracture ( high impedance)

IBHRE Exam (7 decks)

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