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Transcript
Module 12 Electromagnetic force Physical Science Lesson 8 Assignment • Page 311-312 – # 1, 2, 3, 7, 8, 9, 11, 14, 16 Homework • Test Thursday • For track team- test Wednesday in PE 1. Photon: a small ________ of ________ that acts like a _________. 2. Charging by conduction: Charging an _____ by allowing it to come into ____ with an object that already has an __________ _____. 3. Charging by induction: Charging an ____ without _______ _______ between the _______ and a ________. 4. Electrical current: The ___ of ___ that travels past a _________ ______ in an electric circuit each ________. 5. Conventional current: _______ that flows form the _______ side of the ________ to the ________ side. This is the way ________ is drawn in _________ ________, even though it is _________. 6. Resistance: the ________ of a ________ to _______ the flow of _________ 7. Open circuit: a _________ that does not have a __________ connection between the _____ sides of the __________ source. As a result, ______ does not ______. 2. For the following situations, use a solid arrow to draw the force exerted by the circle with the solid line. Use a dashed arrow to draw the force exerted by the circle with a dashed line. - + - - 3. The force between the south pole of a magnet and the north pole of a magnet is measured. If the distance between the poles is increased by a factor of 3, how does the new force compare to the old one? Is the force attractive or repulsive? 1 1 𝐹= 2= 2 𝑑 3 Distance increase, force decrease by 9 North pole and south pole--- attractive 7. If you were to use a positively charged rod to charge an object by induction, what charge will the object have? • induction: opposite charge • So the object will be negative 8. If you were to use a positively charged rod to charge an object by conduction, what charge will the object have? • conduction: same charge • So the object will be positive 9. An electrical circuit uses a large voltage but a small current. Is the energy of each electron high or low? Are there many electrons flowing through the circuit or are there few? Is the circuit dangerous? • Voltage is energy of electrons so – Energy is high • Current is the # of electrons so – There are few • Energy is high so the circuit could be dangerous and should be treated as dangerous • If you have a low voltage circuit that you need to get more energy from, you need to increase the current 11. Draw the conventional current flow in the following circuit. Be sure you can also draw the correct direction of the current 14. 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 • Wider or thicker wire will have less resistance and produce less heat. • If I say your friend is holding two extension cords that are the same length but the one in their left hand is warmer than the one in the right hand, which one is thicker? • The thicker one will be the cooler one 16. 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 two lights work again. Are the lights wired in a parallel circuit or a series circuit? • Series circuit Also know… • for an object to be magnetized, the atoms must be aligned. • When you cut a magnet in half, you now have 4 poles: 2 north and 2 south