U8 Electricity And Magnetism

Question 1

43. Explain how lightening is created

Answer 1

Movement of clouds causes a build up of static electricity. When e- build up enough it induces a + charge on earth. Attraction becomes so great that the e- go to earth to neutralize creating static discharge

Question 2

44. Explain how a battery works

Answer 2

Chem reaction ——> voltage diff between + and - terminals. When connected, this pushes current thorough wire due to voltage diff. E- flow from - to + end

Question 3

48. List two differences between series and parallel

Answer 3

Series has one branch and parallel has multiple. Series- all must work at once parallel- can use one part at a time.

Question 4

50. Find the total resistance and voltage

Answer 4

R= 2.86 ohms

V= 114.4 V

Question 5

In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?

Answer 5

As the electrons are pushed more by the battery, they move faster through the circuit

Question 6

Electric charges always flow from _____ areas to ______ areas

Answer 6

Negative, positive

Question 7

Which of the following statements about electric charge is true ?

Answer 7

Electrical forces act at a distance