EE 100 Final

What’s the unit for current?

Ampere

What’s the symbol for current?

A

What’s the unit for charge?

Coulomb

What’s the symbol for charge?

C

What’s the unit for voltage?

Volt

What’s the symbol for voltage?

V

What’s the unit for resistance?

Ohm

What’s the symbol for resistance?

Ω

What’s the unit for power?

Watt

What’s the symbol for power?

W

femto (f)

10^-15 (one-quadrillionth)

pico (p)

10^-12 (one-trillionth)

nano (n)

10^-9 (one-billionth)

micro (µ)

10^-6 (one-millionth)

milli (m)

10^-3 (one-thousandth)

kilo (k)

10³ (one thousand)

mega (M)

10⁶ (one million)

giga (G)

10⁹ (one billion)

tera (T)

10¹² (one trillion)

Definition of error

The difference between the true value and measured value

Definition of accuracy

How close you are to the true value

Definition of precision

How consistent your measurements are

The current is 0.4 mA. What’s the physical effect?

Slight sensation

The current is 1.1 mA. What’s the physical effect?

Perception threshold

The current is 1.8 mA. What’s the physical effect?

Shock, no pain, no loss of muscular control

The current is 9 mA. What’s the physical effect?

Painful shock, no loss of muscular control

The current is 16 mA. What’s the physical effect?

Painful shock, let-go threshold

The current is 23 mA. What’s the physical effect?

Severe painful shock, muscular contractions, breathing difficulty

The current is 75 mA. What’s the physical effect?

Ventricular fibrillation, threshold

The current is 235 mA. What’s the physical effect?

Ventricular fibrillation, usually fatal for duration of 5 seconds or more

The current is 4,000 mA. What’s the physical effect?

Heart paralysis (no ventricular fibrillation)

The current is 5,000 mA. What’s the physical effect?

Tissue burn

What is voltage?

Energy per charge

What is current?

Flow of charge over time

What is resistance?

How much something resists current

What is power?

How fast energy is used (P = VI)

What is energy?

Ability to do work