Circuit Theory
Resistance
Series Circuits
Parallel Circuits
Ohm's Law Math
100
For electricity to flow around a circuit, it must have this type of complete, closed path
closed loop/circuit
100
This is the unit used to measure electrical resistance
ohms
100
Define a series circuit
One single circuit with multiple components on it
100
Define a parallel circuit
multiple branches for electrons to flow
100
what is the formula of ohm's law?
I=V/R or V=IR or R=V/I
200
This is the main job of a switch in an electrical circuit
to break or complete the circuit (turn it on or off)
200
Which if these symbols represents a resistor?
squiggly lines
200
If I unscrew a bulb in a closed series circuit what happens to the other bulb in the circuit?
turns off
200
What is the total voltage in this circuit?
12v
200
How could you decrease the current in a circuit?
You could decrease voltage or increase resistance
300
Electricity and current flowing through a metal wire are actually made up of these tiny particles
electrons
300
What is the total resistance of this circuit?
18 ohms
300
What would happen to the electrons in this circuit if R3 is broken?
current stops flowing
300
What happens to this circuit if the bottom resistor breaks?
electrons keep flowing through the other branches
300
If voltage stays the same, what happens to the current if you make the resistance twice as big?
halves
400
When a battery is hooked up to a closed circuit, electrons flow in which direction?
negative to positive
400
How could you Increase the current of a circuit that has resistors?
remove resistors or replace with weaker resistors or increase voltage
400
What happens to the light bulbs in a series circuit if you add extra light bulbs
they get dimmer
400
If we added a switch just after the battery which resisters would receive electrons flowing?
none
400
What voltage is supplied to a circuit that has a resistance of 150 ohms if the current in the circuit is 0.12 A.
18 v
500
This specific instrument is used to measure electrical current in a circuit and must be hooked up in the series
ammeter
500
using the theory of resistance how do toasters toast toast?
Toaster wires get red hot because moving electrons smash into atoms, turning their electrical energy into heat energy
500
If we put a voltmeter reading across each side of each resistor what would we notice?
different voltage readings
500
What is the voltage at the middle resistor in this circuit?
12v
500
A small lamp has 6V across it and a current of 0.2A flowing through it. What is its resistance.
30 ohms