unit 6 exercises

Unit 6:

Page 131

3.- Define these concepts : powre source, conductor, load device.Give an example of it.

Power source: Component tat supplies electrical energy to the resistant.

Conductor: Component that transport the electrical energy from the power sources to the load device  

Load device: Component that recives the electrical energy from the power source and convert it to other types of useful energy.

4.-List all the controll and protection devices that you can think of and explain what they do.

One-way switch:open or close the circuit when they are actuated

Push switch:they open or close the circuit, but only while we keep them pressed

Two-way switch:they open and close one or more circuits. They can also open some circuits and close other ones.

Limit switch:it functions as a switch that toggles between two positions when it is operated by a lever

Fuse: they protect the components of electric circuits from  power surges 


5.-Which materials are used to make an electric wire (inside and out)?

  Out is made o plastic an inside is made of copper.


6.-We know that the circuit the figure below is the equivalent circuit of two identical resistors connected in series, that the cell is 9V and that the current flowing throungh the circuit is 0.3mA.

a) Calculate the value of the equivalent resistor.
R= 9V/0.0003A=30Ω
b)Calculate the value of the resistors in the intinial circuit.
30Ω

7.-Study the following two circuits. If lamp 1 blows in each circuit, how would this affect their operation?

If in the firs circuit the first lamp blows the circuit will be open. If in the second circuit the first lamp blows the circuit will be closed because it´s parallel.