EEGR2111 L3
Passive/active elements
-
- Resistors
- Ohms Law
- As above: v = i R
- Plot: straight line through origin
- NOTE: this (v = i R) is for passive convention!!!
- Can also be written i = v / R = v G
- G = 1/R = conductance in siemens (will also see mho)
- Power in resistors
- p(t) = v(t) i(t)
- Substitute using v = i R
- So what is the energy from time - infinity to t?
- Explain why this is a passive device
- Example L3-1:
- A 10 V battery is in series with a 10 Ohm resistor
- What is the current?
- What power p(t) is absorbed by the resistor?
- What energy is delivered from t=1 to t=2 seconds.
- Example L3-2:
- A voltage v(t) = cos(10 t) is in series with a 10 Ohm resistor
- What is the current?
- What power p(t) is absorbed by the resistor?
- What energy is delivered from t=1 to t=2 seconds.
- Example L3-3:
- A current i(t) = cos(10 t) runs through a 10 Ohm resistor
- What is the voltage?
- What power is absorbed by the resistor?
- What energy is delivered from t=1 to t=2 seconds.
- Example L3-4:
- A current i(t) below runs through a 10 Ohm resistor
- What is the voltage?
- What power p(t) is absorbed by the resistor?
- What energy is delivered from t=1 to t=2 seconds.