Energy Types
What is the energy involved with objects in motion?
Kinetic
What charge do protons have?
Positive (or +1)
A battery starts with what kind of energy?
Chemical
Which type of circuit has more pathways for the current to flow?
Parallel
V = I x R
I = V/R
R = V/I
When you drop a ball from a certain height, what energy does it start with and end with?
Potential --> Kinetic
When two objects are charged by friction, which subatomic particle(s) are being transferred or moved around?
Electrons
What units are used for voltage? What is its symbol?
Volts ; V
If you have more than 1 resistors in a series circuit, how can you find the equivalent or total resistance of the circuit?
You add the individual resistors together.
If V = 15V and I = 10A, what is R?
A hydroelectric dam start with potential then converts twice to what kinds of energy?
Potential --> ?? --> ???
Kinetic --> Electric
If 2 neutral objects, A and B, are charged by friction and object A has given up electrons to object B, which one ends up being negatively charged?
Object B; it has gained the electrons object A has lost.
Describe the terms insulators and conductors in terms of the flow of electrons.
Insulators --> slows the flow of electrons
Conductors --> allows the electrons to flow freely
In a parallel circuit, how can you find the voltage for one path?
It is the same as the voltage of the battery.
If V1 = 10V, V2 = 15V and R = 20 Ohms, what is I?
Vtotal = 25V and R = 20 Ohms
I = V/R = 1.25A
Explain the process of nuclear fusion.
New atoms are formed by colliding or combining together.
State the Law of Electric charge AND fill in the following:
Every positive charge __________ another positive charge.
Every negative charge ____________ another negative charge.
Every positive charge _____________ a negative charge.
1. Opposites attract
2. Likes repel
repels; repels; attracts
Explain how the electrons travel around a simple circuit from the negative terminal back to the positive terminal of the battery.
Electrons come out of the negative terminal then travel through the conducting wire then transfers some of its energy to the load. Then they make their way back into the positive terminal of the battery.
If an ammeter is used in different places around a series circuit, what do you expect the current to be?
a. Same anywhere around the circuit.
b. Different in different places.
c. Need more information.
a. Same anywhere around the circuit.
In a series circuit, there are 2 battery and 3 resistors. Calculate the current based on the following:
V1 = 50V; V2 = 15 V
R1 = 25 Ohms, R2 = 50 Ohms, R3 = 10 A
Vtotal = 65V , Rtotal = 75 Ohms
I = V/R = 0.76 Ohms
Explain the step by step process of how nuclear reactors convert into electrical energy. (4 steps)
Nuclear fission --> Reaction releases energy --> That energy is used to boil water into steam --> Turbine spins
Explain how a negatively charged object can be attracted to a neutral wall.
The electrons will repel the electrons in the neutral object but it will be attracted to the numerous protons in the neutral object (i.e. polarization). The neutral object remains neural and only the positions of the protons and electrons change.
Explain why one would use a parallel circuit over a series.
If you break one path, the remaining paths can still work.
You can control which pathways the current travels.
You can split the current into different pathways.
In a parallel circuit, there are 4 paths. The current coming directly out of the battery is 60A. If I1 = 5A, I2 = 10A, I3 = 15A, what must be the value of I4, the 4th pathway?
I4 = Itotal - (I1+I2+I3) = 60 - (30) = 30A
Explain how the current behaves in a parallel circuit. Use a circuit with 1 battery and 3 pathways to explain.
1st junction:
1. Continue to 2nd junction OR
2. Go through the 1st pathway.
2nd junction:
Same as above + etc.