DC Circuits Flashcards
Current in Series Circuit
I= I₁=I₂=I₃
Potential Difference in Series Circuits
V=V₁+V₂+V₃
Current in Parallel Circuits
I=I₁+I₂
Potential Difference in Parallel Circuits
V=V₁=V₂
Resistance in Series Circuits
R=R₁+R₂+R₃
Resistance in Parallel Circuits
1/R=1/R₁+1/R₂
What is a Potential Divider Circuit?
A potential divider is a circuit with resistors arranged in series.
What is a Potential Divider Circuit used for?
To vary the output voltage from a source and drive another part of a circuit
Potential Divider Circuit Formula
V₁=[R₁/(R₁+R₂)] V
What is a Transducer?
Electrical/electronic devices that convert energy from 1 form to another
Respond to physical quantities like temp and light
Used in control systems (eg thermostats)
How does temperature affect the resistance of a Thermistor?
Resistance of thermistor decreased when temperature increases
What is a Thermistor used for?
Used in circuits for temp control and temp measurement in fire alarms
How does the amount of light affect the resistance of a Light Dependent Resistor?
Resistance of LDR decreases with increasing amount of light
What is an LDR used for?
Used in light sensors in circuits (eg burglar alarms)
What is a Diode?
Circuit component that allows flow of current in 1 direction only
How does the resistance of a Diode change with direction?
Resistance in 1 direction is very low. In reverse direction, resistance is very high/almost infinite
