Ohm's Law
Parallel Circuits
Series Circuits
Circuit Grab Bag
100
What are the 3 formulas for Ohm's Law?
V = IxR
I = V/R
R = V/I
100
True or False: A parallel circuit has one pathway for the current to take.
FALSE
100
How many pathways can a current flow in a series circuit?
One
100
List the four ways you can change the resistance of a wire.
Temperature
Thickness
Length
Material
200
Voltage increases when current increases.
Voltage decreases when resistance ______________.
increases
200
In a parallel circuit with 3 lightbulbs, what would happen to the other lightbulbs if one were to go out?
They would still stay on and would not go out.
200
Which lab tool is used to measure the electric current flowing through a circuit?
ammeter
200
DOUBLE JEOPARDY:
What is a resistor?
A device in electrical circuits that uses electrical energy to interfere with the flow of electric charge and slow it down.
300
When a current of 3 amperes is run through the coiled heating element of a stove, the resistance of the element is 80 ohms. What is the voltage of the stove?
240 volts
300
What are the units of measure for resistance, current, and voltage?
V (V)
I (Ampere)
R (Ω)
300
In a series circuit, if one bulb goes out, why do all the other bulbs go out? Explain.
All parts of the circuit are connected one after another. There is no other path for the current to take.
300
What will definitely be the same no matter the color?
Voltage, Current, Resistance?
Voltage
400
A walkman uses a standard 1.5 V battery. How much resistance is in the circuit if it uses 0.01 amps?
150 ohms
400
As additional resistors are added to a parallel circuit, what happens to the brightness of light?
There is no change
400
As additional resistors are added to a series circuit, what happens to the brightness of light?
It dims
400
DOUBLE JEOPARDY: As the length of a wire increases, what happens to the resistance?
The resistance increases
500
A frying pan is connected to a 110-volt circuit. If the resistance of the frying pan is 10 ohms, how many amperes does the frying pan draw?
11 amps
500
DOUBLE JEOPARDY!
What is the total current of this circuit?
11 amps
500
Explain why copper metal is a good conductor of electricity.
The electrons are able to flow easily and quickly
500
What is a fuse?
A device that prevents a circuit from overheating and causing a fire. Contains a piece of metal that bends when the current in it is too large.