B. Test your Understanding! Write the letter on a separate sheet.
1. Which of the following is not true
a) In order for electrons to flow they need a closed circuit
b) the source of energy in a circuit can be a battery, thermocouple or photocell c) there are two types of circuits, series and parallel
d) The load of a circuit offers no resistance to the circuit
2. The way a fuse works is
a) as current in the wire increases beyond a certain point a chemical change occurs which converts the conducting material to an insulating material. This cuts off the flow of current. b) )the fuse contains a thin strip of metal inside a closed container. When too much current flows the strip melts and this causes a break in the circuit
c) a fuse works when the metal inside expands from the heat and break the container causing a short.
d) a fuse contains a vacuum which allows current to flow. When too much current flows through the fuse the vacuum is lost and the circuit is broken.
3. What is the main disadvantage of a series circuit?
a) the cost to maintain the parts for a series
b) the main disadvantage of a series circuit is that if there is a break in the circuit the entire circuit is open and no current will flow.
c) a series circuit can only be used with low current
d) a series circuit can only be used with low voltage loads
4. In your home the socket contains 3 holes. Which statement is not correct about these holes.
a) Two of the wires run parallel to each other and contain 120 volts in the US.
b) In Europe the potential difference is 220 volts
c) all 3 wires are live and contain current
d) The third wire does not contain current but is connected to the ground
5. Why is your home wired in a parallel circuit
a) When appliances in your home are connected in a parallel, each of them can be put on and off independently.
b) It ensures all components in the circuit have the same voltage as the source. c) Both are correct
Guide Questions..!
1. Give an example of devices that uses electricity at home.
2. Identify the types of circuit they used.
Rubric for scoring :( if necessary)
Reflection: Write your reflection about the Lesson..
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Answer:
1.D
2. B
3.B
4.D
5.C
guid question
1.light bulb,appliances
2.parallel
Explanation:
Reflect I know what are the circuit used in the house
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