Please Help!!!!! Please Do Not write in cursive, write Neat!!! Real Lab Fruit Ba
ID: 1661645 • Letter: P
Question
Please Help!!!!! Please Do Not write in cursive, write Neat!!!
Real Lab Fruit Batteries
Materials
grapefruit, orange, or apple cut into quarters
4 zinc probes (galvanized nails)
4 copper probes (copper straps)
5copper wires (with alligator clamps optional)
1 LED (light emitting diode) (available at many places such as Radio Shack)
Procedure
Press a copper probe and a zinc probe into the grapefruit sections in such a way that they are a centimeter or two apart and not touching (it is crucial that they not be touching).
Use the wires to connect the orange batteries in series leaving a copper probe as a negative terminal and the zinc probe as a positive terminal.
Now connect the orange battery to the LED. Note: The longest leg of the LED is the positive end.
Real Lab Electromagnet
Materials
index cards or 3 emptied toilet paper cylinder
three large iron nail (about 3 inches)
about 3 feet of THIN COATED copper wire
masking tape
battery (C or D)
some paper clips
Preparation of the Electromagnet
Roll the index card into a tube and tape it shut. Cut it into three equal lengths, so you have three identical cylinders taped shut. (You can cut then make the cylinders if you make sure you make them all the same diameter when you tape them shut.)
OR
Use the three emptied toilet paper cylinders.
Wind one of the tubes with 10 turns of wire, one with 20 turns of wire, and one with 30 turns of wire.
NOTE: Make sure you leave plenty of wire free at the beginning and end to be able to connect it to the battery.
Procedure I
Connect each of the coils of wire to a battery, C or D, by taping one end of the coil to one terminal and touching the wire briefly to the other.
NOTE: Do not connect the battery for more than ten seconds since the wire can become hot enough to burn fingers.
Procedure II
Place a nail through the coil and test each coil again the way you did in Procedure I.
Place two nails through the coil and test each coil again the way you did in Procedure I.
Place three nails through the coil and test each coil again the way you did in Procedure I.
Electric Motor and Electric Generator
The electric generator and the electric motor are two devices that transform one type of energy into another type of energy.
The Electric Generator
In the case of the electric generator, mechanical energy - in this case the rotation of a coil performed by a person - is converted into electric energy - the light bulb shines bright.
The Electric Motor
In the case of the electric motor, electric energy - from the battery current flows through the coil of wire (also called the armature) - is converted into mechanical energy - the rotation of the coil in the magnetic field due to the magnet below.
AC and DC
Direct Current (DC)
Electrons flow in one direction through the circuit and/or wires.
Produced by solar cells and batteries(a battery is a combination of chemical cells)
Electrons flow through the circuit starting at the negative terminal (which repels the electrons) to the positive terminal (which attracts the electrons).
Alternating Current (AC)
Electric current from the outlets in your home, school, or work are alternating current.
AC is usually produced by a generator using the principle of electromagnetic induction.
In a generator, either the magnet or a coil of wire spins. Because of this the generator's terminals switch (or alternate) between positive and negative.
Electrons are repelled by the negative terminal and attracted to the positive terminal.
Since the two terminals are constantly switching (positive to negative and back to positive) the current keeps changing direction (alternating).
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Answer the Questions 10, 11, 12, 13, 14, 15
Q10. Find out what different power plants use to convert energy eventually in the last step into electric energy and report your findings here.
Q11. Find in your household at least three appliances and/or tools that use electric energy to produce mechanical energy. Hint: Most appliances and/or tools convert electric energy into rotational kinetic energy.
Q12. In a DC circuit, why are the electrons repelled from the negative terminal and attracted to the positive terminal?
Q13. What is electromagnetic induction?
Q14. Describe the difference in the flow of electrons between AC and DC circuits.
Q15. When you charge your cell phone you use a special plug. What is this device called, what does it do, and why is it necessary?
Explanation / Answer
10. A. Hydropower Plant B. Thermal Power Plant C. Wind Power Plant D. Nuclear Power Plant
11. An.Electrical Motor(Use to store water) B. Mixer Grinder C. Celling Fan D. Elevator Etc
12. Electron has negative charge thats why they are repelled by negative terminal to postive side.
13. According to Faraday's Law changing magnetic field generates potential which causes current flow in a conductor. When there is a changing magnetic field/Flux across a conductor it generates electromagnetic force (EMF or Voltage).
14.In DC electron flow from lower potential to higher potential and current from higher to lower. But in AC electron oscillates about their mean position. In DC electron flow in a direction but IN AC Direction of electron changing.
15.Adapter Let's See Different electric devices are operated on AC Source. Adapter Mainly provides interface to adopt one device to another. It helps to overcome any voltage fluctuation that can harm our electronics devices such as computer, Mobile Elc.