# 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.

## Presentation on theme: "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."— Presentation 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?

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:

Whole Brain The property of matter that is responsible for both electricity and magnetism is: CHARGE

Whole Brain What is this?

Whole Brain What is this? Electromagnet

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?

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:

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:

Whole Brain Placing the north pole of a magnet near the south pole of another magnet results in: ATTRACTIVE FORCE

WHOLE BRAIN Which shows a repulsive force?

WHOLE BRAIN Which shows a repulsive force?

WHOLE BRAIN Which part of a bar magnet has the strongest magnetic 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):

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 A motor’s basic function is to convert:

WHOLE BRAIN A motor’s basic function is to convert:

WHOLE BRAIN A motor’s basic function is to convert: ELECTRICAL ENERGY into MECHANICAL ENERGY

WHOLE BRAIN Electromagnetic induction occurs when:

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 Mechanical energy is transformed into electrical energy by a(n):

WHOLE BRAIN Mechanical energy is transformed into electrical energy by a(n):

WHOLE BRAIN Mechanical energy is transformed into electrical energy by a(n): A GENERATOR

WHOLE BRAIN electric motor spins because:

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 What happens if you reverse the direction of current flow in an electromagnet?

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)

WHOLE BRAIN -- Now turn to your partner and tell them ---What a motor does…… --what a generator does ---How current can be induced / not induced --What happens when you cut a magnet in half

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