Topic 3 Flashcards
_________ is a property of a substance that hinders motion of electric charge and converts electric energy into other forms
of energy.
Resistance
The standard unit for resistance is the ____, symbolized by the Greek letter omega (Ω).
Ohm
Resistance can be measured directly
with an __________.
Ohmmeter
________ ________ is calculated by finding the ratio of the voltage across the load (V) to the current through the load (I). Using R to represent resistance.
Electrical Resistance
What is V=IR?
It is Ohm’s law
What do the letters in V=IR stand for?
- V = Voltage
- I = Current
- R = Resistance
________ _________ do not have a fixed resistance. Instead, their resistance changes in response to temperature, light, voltage, or some other variable.
Variable Resistors
when solving for total voltage in a series circuit what do you do?
You add all the voltages to find the total.
when solving for total voltage in a parallel circuit what do you do?
all voltage remains the same (asuming they are all in seperate paths)
when solving for total resistance in a series circuit what do you do?
you add all individual resistances in the circuit to find the total resistance
when solving for total resistance in a parallel circuit what do you do?
you need to divide one by each of the individual resistances and add them to get an answer then divide that answer by one to find the total resistance
when solving for total current in a series circuit what do you do?
all current remains the same anywhere throughout a series circuit
when solving for total current in a parallel circuit what do you do?
the total current is equal to the sum of all the individual currents on each leg of the circuit
how to solve for total resistance in a complex circuit?
first look at the series part of the circuit and reciprocate the charges and add them, then take the parallel side and find the resistance reciprocated on each leg then add all and reciprocate the answer and you have the total resistance in a complex circuit
