questions about electric circuits

ROCKWELL INTERNATIONAL SCHOOL

Name: ........................................... Grade: 8 Worksheet Electricity

1. What kind of energy does a cell store?

2. What do you call it when two or more cells are connected?

3. Could you write a definition of electric current?

4. In which direction does the electricity flow in a circuit?

5. What are the components of an electric circuit?

6. What happens if there is a break in a circuit?

7. Could you draw 10 electric symbols and write their names?



8. Could you write two characteristics of serial circuits?

9. Could you write two characteristics of parallel circuits?

10. What unit is electrical current measured in?

11. What device is used to measure electric current?

12. What device is used to measure voltage?

13. Are ammeters and voltmeters connected in a circuit in the same

way?

14. Give the synonym for voltage.

15. What an ammeter does in a circuit?

16. What is the function of voltmeter in a circuit?



Series and Parallel Circuits

A Series Circuit is __________________________________________________

_________________________________________________________________.

A series circuit has only ______ path

If the circuit is interrupted, the circuit _______________ function.

The amount of current is the ____________ in all parts of a series circuit.

Draw the Series Circuit Diagram:

Parallel Circuits

__________________________________________________________________

__________________________________________________________________

An interruption in a parallel circuit ___________ affect the other pathways in the circuit.

Draw the Parallel Circuit Diagram:



2 Draw a circuit diagram that include: 2 batteries 1 switch

2bulbs, labelled A and B

The circuit diagram must show the following:



Bulb A is lit all the time Bulb B is lit when switch is closed

Bulb B is not lit when the switch is open

3 (a) Anita wanted to investigate which rods, W, X, Y or Z is a conductor of electricity.

She placed each of the 4 rods as described in the table below in the circuit shown above at point A, B and C

and recorded her observations if the 3 light bulb, L1, L2, L3 in the table below.

A B C L1 L2 L3X Y W Not lighted Not lighted Not lightedX W Y Lighted Not lighted LightedW Y Z Not lighted Not lighted Not lightedZ Y X Not lighted Lighted Lighted

Based on the results, which rods are conductors of electricity?

…………………………………………………………………………………………………………………..

(b) Anita rearranged the circuit and added a battery and 2 bulbs, L4 and L5 as shown below.

From the results in part (a), where should she place rods, W, X, Y and Z if she wants the most number of



bulbs to light up?

A : _________ B : __________ C : _________ D : __________ 4 What are conductors and insulators? Give two examples each.

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

4 Study the two circuit diagrams below carefully.

(a) What is the advantage of Circuit A?

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

(b) Which circuit would you choose for your house? Explain your answer

…………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………..

5 Ethan was given the following items to carry out an investigation on 2 rods, A and B. He has to find out which rod, A or B, is made of a material that conducts electricity. Only one of the rods conducts electricity.

(a) In the space provided below, draw one circuit diagram with all the given materials above to determine which rod, A or B, is an electrical conductor. Use appropriate symbols to represent the batteries and bulbs in your diagram



(b) Based on the diagram drawn, explain how Ethan can conclude which rod is an electrical conductor.

…………………………………………………………………………………………………………………..

6 Jane set up the circuit tester as shown in the diagram below to test the electrical conductivity of the 3 materials, A, B or C.

The results are shown in the table below.

Materials used in the circuit Brightness of bulbA DimB BrightC Bulb did not lit up

(a) Based on the experiment above, compare the electrical conductivity of the 3 materials, A, B and C. …………………………………………………………………………………………………………………..

……………………………………………………………………………………………………………………

(b) Study the diagram below.

(b) Which material (A, B or C) is most suitable for making Part Q of the plug? Give a reason for your answer

…………………………………………………………………………………………………………………..



7 Study the circuit below.

In the space provided, draw a circuit diagram of the above set up.

8 Study the circuit below. All bulbs in the closed circuit are shining brightly.

(a) Which of the bulb(s) in the above circuit will not light up if Bulb S fuses?

…………………………………………………………………………………………………………………..

(b) Explain your answer in (a).



…………………………………………………………………………………………………………………..

……………………………………………………………………………………………………………………

9 The diagram shows an incomplete diagram of the internal parts of a bulb. (a) Complete the diagram by drawing the metal wires to show how they are connected within the bulb. (b) Name the following parts of the bulb.

X: _________________________________

Y: _________________________________

10 The diagram below shows an electric circuit.

Draw a circuit diagram in the space provided to represent the

electric circuit.

11 Wires used in households are made of copper wrapped with rubber.

Explain why rubber is used to wrap around copper wires.

12 The diagram below shows an electric circuit.

Which of the following would result in Bulb X being the brightest?

S1 S2 S3 S4

1 Close Close Open Open

2 Close Open Close Open

3 Open Close Open Close

4 Close Open Open Close


Name: ........................................... Grade: 8 Worksheet ElectricityA. 1 B.2 C.3 D.4

13 The diagram below shows 4 electrical circuits.



Which of the bulb(s) in the circuits above will light up?

A. B only B. A and B only C. B and C only D.C and D only

14 Study the circuit below. All bulbs in the closed circuit are shining brightly.

a) Which of the bulbs in the above circuit will not light up if Bulb S fuses?

b) Explain your answer in (a).

15 2 bulbs of the same size were connected to the circuits as shown in the diagrams below. The batteries and wires were also of the same type. When the circuits were connected, both bulbs were gounf to be equally



bright.

a) Explain why the bulb in Circuit B was not brighter than the bulb in Circuit A even though 3 batteries were used in Circuit B as compared to 1 in Circuit A.

b) Using the same components suggest 1 way in which the bulb in Circuit B can be made brighter.


Name: ........................................... Grade: 8 Worksheet Electricityhttps://tecnoelpalo.wikispaces.com/

NOTE.- In order to answer the questions above you have to read the presentation in: tecnoelpalo.wikispaces.com ->

electricity.

https://tecnoelpalo.wikispaces.com/

questions about electric circuits

Documents

electric circuit

circuit diagrams

advantage of circuit

parallel circuit diagram

series circuit diagram

b anita

time bulb b

closed bulb b