Static Electricity
How does static electricity build up? (State key terms)
What part of the circuit converts electricity to other forms of energy?
The Load
What is electric current?
The amount of charge that flow in a wire (rate of flow)
What is the formula for Ohm's Law
V = I x R
What is a circuit with 2 or more paths called?
A parallel circuit.
What is "grounding"
A way to neutralize a charged object by connecting it to the Earth with a wire.
What are Conductors?
Materials that allow the flow of electrons easily.
What is Voltage
A toaster has 57Ω of resistance and 31A of current. How much voltage does it take? (calculator allowed and show your work on whiteboard)
V = I x R V = ?
V = 57Ω x 31A I = 31A
V = 1767V R = 57Ω
If one bulb of a series circuit gets burnt out, what will happen to the rest of the bulbs?
All the other bulbs will not work.
What is "static discharge"
The gaining or losing electrons to to balance the charge.
The rocks in a waterfall are like...
the resistance in a circuit.
Very small amounts of current are measured with a/an...
Galvanometer
Resistance is measured with a/an...
Ohmmeter
What is the symbol for variable resistor? (draw with whiteboard)
Shark teeth with arrow pointing to it.
State the 3 laws in "The Law of Charges" and say the key terms
Like charges repel
Charged objects attract uncharged objects (CHARGE SEPERATION)
Jonathan turns on his stereo system to listen to his latest CD purchase. When his brother's favorite song comes on, he yells from the other room for Jonathan to turn up the volume. The volume controller is a..
Variable resistor
You are investigating various wire types to use as a resistor. Which wire characteristics will provide the most resistance?
A long, thin wire
What device measures both current and voltage?
A multimeter.
A toy oven uses the heat from a light bulb to bake a small cake. What does this tell you about the energy that the light bulb produces?
Most of the energy produced is dissipated as heat.
In the middle of winter, when the air is dry, Dan loves to taunt his younger sister Nicki, with static electricity. He would rub his feet along the carpet to build up a charge and then touch his unsuspecting sister with his index finger. If Dan was positively charged compared to Nicki, he would have...
Lost Electrons
What is a semi-conductor?
A material that conducts electricity under certain conditions.
What are the 4 Factors that affect the resistance of a wire (Name all 4 and factors)
Gauge (the thicker the wire, the less resistance), Length (resistance increases with length), Temperature (as temperature increases, so does resistance), and Material (some material's atomic structures allow the electrons to flow more quickly)
The current in a system is 200A. If it is running using a 100V Battery, and three lightbulbs are used, how much resistance does the circuit have?
R = V/I
R = 100V/200A
R = 0.5Ω
0.5Ω/3 = 1.7Ω
A circuit is built with 4 identical lightbulbs built with the following features:
- All lights are turned off and on by 1 switch
- Each bulb emits equal brightness
- If 1 bulb dies, the others stay on
(draw on whiteboard)
I can't put pictures on this so ask host