Upload
merilyn-reed
View
213
Download
0
Tags:
Embed Size (px)
Citation preview
Your TopicTools we use to measure
Resistance and Resistivity
Current Electricity
Series and Parallel Circuits
Cut out the Static
200 200 200 200 200
400 400 400 400 400
600 600 600 600 600
800 800 800 800 800
1000 1000 1000 1000 1000
Bonus Question: 5000 pts
Topic 1: 600• Question:• Ammeters are connected in
while voltmeters are connected in .
• Answer• Series; Parallel
Topic 1: 800• Question:• Ammeters have resistance
while voltmeters have resistance.
• Answer• Very little; Very much
Topic 2: 200• Question:• What is resistivity?• Answer• Resistivity is an intrinsic property of a
material, which is a measure of the conductive ability of the material. The lower the value, the more conductive the material is.
Topic 2: 400• Question:• What is a resistor?• Answer• A component in an electrical circuit, which
“resists” the flow of electrons.
Topic 2: 600• Question:• What is Resistance?• Answer• The ratio of the voltage drop across a device
to the current flowing in it.
Or the hindrance to the flow of charge.
I
VR
Topic 2: 800• Question:• As the length of a conductor increases, its
resistance will while its resistivity will .
• Answer• Increase; remain the same
Topic 2: 1000• Question:• Determine the resistance of a copper wire
that is 2.00 meters in length and has a radius of 150.m
• Answer• 0.487
Topic 3: 400• Question:• A 40 Volt battery is connected to a 20 Ohm
resistor. What is the current flowing in the circuit?
• Answer• 2 Amperes
Topic 3: 600• Question:• 2 amperes of current is equivalent to how
many electrons per second?• Answer• 1.25x1019 electrons per second
Topic 3: 800• Question:• A cloud transfers 25 Coulombs of charge to
the earth during a discharge lasting 0.75 seconds. What is the current flow.
• Answer• 33.3 Amperes
Topic 3: 1000• Question:• A cloud transfers 10,000 Coulombs of charge
to the earth during a discharge lasting 0.50 seconds. If the potential difference between the cloud and the ground is 25,000,000 Volts, what is the resistance of the atmosphere?
• Answer• 1250 Ohms
Topic 4: 200• Question:• How do you find the total resistance and
voltage in a series circuit?• Answer• You sum up the individual values for R and V.
Topic 4: 400• Question:• Adding another resistor to a series circuit will
cause the equivalent resistance to…• Answer• Increase
Topic 4: 600• Question:• A 2, 4 and 6 Ohm resistor are connected in
parallel. Which resistor will have the greatest current and which one will have the least?
• Answer• The 2 resistor will have the greatest current
while the 6 resistor will have the least. Remember: Electricity follows the path of least resistance.
Topic 4: 800• Question:• Determine the equivalent resistance for 3
identical 6 resistors connected in series and parallel
• Answer• In series: Req = 18
• In parallel: Req = 2
Topic 4: 1000• Question:• A 16 and 26 Ohm resistor are connected in
parallel across a potential difference of 40. V. What is the current in the circuit?
• Answer• 4.0A
Topic 5: 600• Question:• Conservation of charge means…• Answer• The total charge of a system is constant. It
can neither be created, nor destroyed.
Topic 5: 800• Question:• Explain why a neutral object can be attracted
to a charged object.• Answer• Due to separation of charge. Electrons are
either attracted to the surface or repelled resulting in a surface charge.
Topic 5: 1000• Question:• A proton experiences a force of 2.0x10-20N.
What is the electric field?• Answer• 0.125N/C
Bonus Question: 5000 pts.
• Question:• A proton is released from rest between two
parallel plates where the electric field strength is 25,000 V/m. Determine the acceleration of the proton.
• Answer• 2.4x1012 m/s2
The Winner Of The Last RoundWrite Down How Much Money
You Are Willing To RiskIf You get the Question write you win that money
If you get it wrong you Loss the money!