Unit D - Section 2 Flashcards
Superconductors
Perfect conductors - have no resistance flow
Resistor
Allows electric current to pass but provides resistance to flow
Resistance
A measure of how difficult it is elcetronsto flow through a substance
Ohms
A unit of measurement for resistance
Variable resistor
A device to measure resistance
What is Ohm’s Law
If you increase the voltage in a circuit, the current also increases.
Voltmeter
A device used to measure voltage
Ammeters
Uses to measure electric current
Galvanometers
Meters used to measure small currents
Multimeters
Used to measure voltage, current or resistance
Schematic
A drawing with symbols that represents a circuit
Series circuit
Only one pathway for the current when the pathway that is interrupted the circuit cannot function
Parallel circuits
Have a seperate current path for each section of the circuit; if a bulb is interrupted the rest of the circuit still functions
What uses parallel circuits
Many household wiring
Transistors
Transistors are tiny devices that are found in an electronic appliance
What are transistors made out of
Made of solid material with no moving parts
Microcircuits (integrated circuits)
A circuit on a extremely small scale
Microcircuits are made out of transistors and resistors
What are microcircuits made out of
Made out of microscopic transistors and resistors
An electric stove us connected to a 240- V outlet. If the current flowing through the stove is 20 A, what is the resistance of the heating element?
R = V / I
= 240 V / 20A
= R = 12 Ohms
What does a source provide in a circuit
A source provides energy and supply of electrons
What does a conductor provide in a circuit
Provides a path for the current
What does a switching mechanism provide for a circuit
Provides turning it off and on
What does a load convert in a circuit
Electrical energy into another form of energy
Cell in a circuit
Stores energy
