Topic 2 - Electricity Flashcards
1
Q
Electricity
A
- Invisible force
- Produces heat / light / motion by attraction or repulsion / etc
2
Q
Electric charge units
A
Coulomb
3
Q
Current units
A
Amps
4
Q
Voltage units
A
Volts
5
Q
Resistance units
A
Ohms
6
Q
How does electricity produce work?
A
Separation of charges between protons and electrons
7
Q
Electron flow direction
A
From negative to Positive
8
Q
Current
A
- The flow of charge in a certain amount of time
- 1 amp = 1C/sec
I = Q/T
9
Q
Factors that affect resistance
A
- Type of material (conductor or insulator)
- Cross-sectional area of wire
- Length of wire
- Temperature of wire
10
Q
Ohms’s Law
A
V=IR
11
Q
Ohm’s Law for Fluids
A
Delta P = QR
P=Pressure (mmHg)
Q=Flow (L/min)
R=Resistance (Dyne sec/cm^5)
12
Q
Electrical interference in OR
A
- 60 cycle interference
- Caused by electrical equipment if set up incorrectly
- Shows on ECG
13
Q
AC vs DC
A
- AC can sustain high voltage over long distance
- DC voltage can be increased/decreased with transformers
- OR machines get power from AC first, then convert to DC internally (safety reasons)
14
Q
Series Circuit
A
- V total = V1 + V2 + V3
- I total = I1 = I2 = I3
- R total = R1 + R2 + R3
15
Q
Parallel Circuit
A
- V total = V1 = V2 = V3
- I total = I1 + I2 + I3
- 1/R total = 1/R1 + 1/R2 + 1/R3
