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Module 12
| Question | Answer |
|---|---|
| Photon | A small "package" of light that acts like a particle |
| Charging by conduction | Charging an object by allowing it to come into contact with an object that already has an electrical charge |
| Charging by induction | Charging an object without direct contact between the object and a charge |
| Electrical current | The amount of charge that travels past a fixed point in an electric circuit each second |
| Conventional current | Current that flows from the positive side of the battery to the negative side. This is the way current is drawn in circuit diagrams, even though it is wrong. |
| Resistance | The ability of a material to impede the flow of charge |
| Open circuit | A circuit that does not have a complete connection between the two sides of the power source. As a result, current does not flow |
| Like charges - | like charges repel one another and will exert forces pushing the other directly away. |
| Opposite charges - | opposite charges attract and will therefore exert forces pulling the other directly in |
| The force bet. the south pole of a magnet and the N pole of another magnet is measured. If distance bet. two is increased by factor of 3 how does compare? Is force attractive or repulsive? | The electromagnetic force is inversely proportional to the square of the distance bet. the objects. If distance is multiplied by 3, the force is divided by 9. Since poles are opposite, it is an attractive force. |
| 2 charged particles are placed 10 cm from each other and force is measured. The charge on object #1 is then doubled and the charge object #2 is left the same. Distance between is reduced to 5 cm. What is the new force? | Electomag force directly proport. The 1st charge is doubled, the force is doubled. 2nd charge left the same, there is no change in charge. Force varies inversely with square of distance bet. objects. Dis. is divided by 2, force x by 4 - 2x4=8 times st |
| What causes the electromagnetic force? | The exchange of photons causes the electromagnetic force. |
| Why don't charged particles glow? | Charged particles do not glow because the photons they emit are not visible to you and me. |
| If you were to use a positively charged rod to charge an object by induction, what charge will the object have? | Charging by induction results in a charge opposite of the rod. The object will be negatively charged. |
| An electrical circuit uses a large voltage by a small current. Is the energy of each electron high or low? Are there many electrons through the circuit, or are there few? Is the circuit dangerous? | Each electron has high energy. Few electrons flow through the circuit. The circuit could be dangerous |
| If you were to use a positively charged rod to charge an object by CONDUCTION, what charge will the object have? | The object will be positively charged. |
| Under what conditions is an electrical circuit reasonably safe? | A circuit is reasonably safe when both the voltage and the current are low. |
| Conventional current flows - | Conventional current flows from the positive side of a battery to the negative side. |
| What is wrong with conventional current? | Conventional current assumes that electricity is the flow of positive charges. |
| You have two wires. ONe is long and the other is shorts. Other than that, they are identical. Which has more resistance? | The longer wire has more resistance. |
| You have two wires. One is thin, and the other is very thick. When the same current is run through each wire, which will get hotter? | The thin wire will get hotter. |
| In which circuit will the light bulb glow? | In circuit where the open switch makes it impossible for any current to flow - thus the light bulb won't glow. in circuit b the ligh bulb glows because the open switch is parallel to the light bulb. Current can still flow through the bulb. |
| Three lights are in a circuit. When one burns out,, they all go out. When the burnt-out one is replaced with a good light, the other 2 work again. Are the lights wired in a parallel circuit or a series circuit? | The bulbs are wired in a series circuit, because a burnt-out bulb acts like an open switch. If the open switch turns off the bulbs, it is wired in series with the other bulbs. |
| If it takes a flow of charged particles to make a magnet, where is the charged particle flow in a permanent magnet? | In a permanent magnet, the flow of charged particles is the motion of the electrons in its atoms. |
| Is it possible to have a permanent magnet with only a north pole? | As far as we know, this is not possible. Magnets must have both a north and south pole. |
| Is it possible to make a magnet from something that is not a magnet? | Yes, it is possible. If the material responds strongly enough to a magnet, you can align its atoms and make it a magnet. |
| If a material does not respond to a magnet, what can you conclude about the atoms in that material? | If a material is not magnetic, its atoms cannot be aligned. As a result, the flow of electrons is random, and the material cannot respond to a magnet. |
Created by:
davisjuring
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