Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

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Ohm’s Law

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Transcript of Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Page 1: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Ohm’s Law

Page 2: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Conductor•A conductor is a material that current can pass through easily, like metals.

Page 3: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Insulator•An insulator is a material that current cannot pass through easily, like plastic.

Page 4: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Resistor•A resistor is a material that resists, but doesn’t stop the flow of current.

Page 5: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

ResistanceOpposition to the flow of electrons.

It changes electrical energy into thermal energy and/or light.

Measured in ohms. Conductors have less resistance than insulators.

Page 6: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Wire resistance greater for:

1) Longer wires

2) Thinner wires

3) Higher temperatures

Page 7: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Electrical Resistance.– This is when current flow is slowed down.– Current seems to lose energy. Actually, the electrical

energy is converted into heat and/or light.– The symbol is R.– The unit is the ohm ().

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Page 8: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Flowing charge is called current. The symbol is I and the unit is the ampere or amp (A).

SIM

http://micro.magnet.fsu.edu/electromag/java/filamentresistance/index.html
Page 9: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

For your notes: Electric Current

1. The reason electric charge flows from one place to another is voltage. a. Voltage is the difference in electrical potential between two places where electrons are flowing.

b. Voltage is the “push” that makes electric charges move.

c. Measured in volts (V).

Page 10: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

2. The flow of electric charge is called current.

a. Current is measured in amperes, or amps (A).

b. Voltage causes current.

3. The amount of electric charge is measured in coulombs.

a. 1 coulomb is the charge carried by 6.24 x 10^18 electrons.

b. 1 amp is 1 coulomb per sec.

Page 11: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

6. Ohm’s law

Voltage = Current * Resistance V = I * R

I

V

R

Page 12: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Connecting Ohm’s Law to Water

How would turning the speed of a water hose up (more voltage) affect the current (amount of water flowing out of the tube)?

V = I * R

Page 13: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Connecting Ohm’s Law to Water

If resistance on a water hose goes up (you clamped the tube) how would the current change if you kept the hose on the same speed or with the same force (voltage was the same)? V = I * R

Page 14: Ohm’s Law Conductor A conductor is a material that current can pass through easily, like metals.

Connecting Ohm’s Law to Water

Suppose you clamped the tube (increased the resistance) AND you wanted more water to come out of the tube (increase current), what would you need to do to the voltage (the flow of the water)?

V = I * R


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