whole brain. electric doorbells found in many homes require 8 v to operate. a transformer is used to...
TRANSCRIPT
WHOLE BRAIN
•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil?
WHOLE BRAIN
•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil?
WHOLE BRAIN
•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN
•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN
•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•Electric doorbells found in many homes require 8 V to operate. A transformer is used to convert standard household 120 V to the 8 V required by the doorbell. If the Primary Coil on the transformer has 150 turns, how many turns are present on the Secondary Coil? STEP DOWN TRANSFORMER
WHOLE BRAIN•-- Now turn to your partner and tell them how you go about solving them
---First you write the? ---Then you look for ---Then you…..
WHOLE BRAIN
•If the voltage in the above transformer has gone up, what happens to the current in the transformer?
WHOLE BRAIN
•If the voltage in the above transformer has gone up, what happens to the current in the transformer?
•If one went up….the other MUST GO DOWN (The numbers have a relationship I = V/R)
WHOLE BRAIN
•If the primary coil of wire on a transformer is kept the same and the number of turns of wire on the secondary is increased, how will this affect the voltage observed at the secondary?
WHOLE BRAIN
•If the primary coil of wire on a transformer is kept the same and the number of turns of wire on the secondary is increased, how will this affect the voltage observed at the secondary?
More wires are wrapped on the secondary coil….so voltage is stepped up
Warm-UP
•Which of the following uses an electromagnet to convert electrical energy to another form?
•YOUR SPEAKERS
Whole Brain
•The property of matter that is responsible for both electricity and magnetism is:
•CHARGE
WHOLE BRAIN•-- Now turn to your partner and tell them
•---about an electromagnet•---what your speakers use•---the relationship of the numbers…when 1 goes up the other goes….
Whole Brain
•What happens if you increase the current in an electromagnet?
•The magnetic field will be stronger
WHOLE BRAIN
•Three ways you can increase the strength of an electromagnet are:
•INCREASE CURRENT•INCREASE NUMBER OF TURNS of wire•Wrap the wire around an Iron CORE
Whole Brain
•Placing the north pole of a magnet near the south pole of another magnet results in:
•ATTRACTIVE FORCE
WHOLE BRAIN
•Which part of a bar magnet has the strongest magnetic force?
•BOTH POLES ARE EQUALLY STRONG
WHOLE BRAIN
•The type of magnet made using wires and electric current is a(n):
•Electro magnet electr = electricity
WHOLE BRAIN•-- Now turn to your partner and tell them
•---attractive forces•---repulsive forces•--3 ways to increase the strength of the electromagnet
WHOLE BRAIN
•Electromagnetic induction occurs when:
•current is induced in a wire by an moving magnet.
WHOLE BRAIN
•A current can be induced to flow in a coil when:
•Sliding magnet across a coil of wire•NOT JUST HOLDING THE MAGNET
WHOLE BRAIN
•electric motor spins because:
•an electromagnet attracts and then repels magnets in the rotor.
WHOLE BRAIN
•If a 12-inch long bar magnet is cut into two pieces, one inch from the north pole end of the magnet:
WHOLE BRAIN
•If a 12-inch long bar magnet is cut into two pieces, one inch from the north pole end of the magnet:
WHOLE BRAIN
•If a 12-inch long bar magnet is cut into two pieces, one inch from the north pole end of the magnet:
•You make 2 magnets (both have a north and a South pole)
WHOLE BRAIN
•What happens if you reverse the direction of current flow in an electromagnet?
•The magnetic field reverses (poles are switched)