Draw:
a) an atom that has 4 protons and a net charge of +2
b) an atom with 10 electrons and a net charge of -1
c) a neutral atom with 5 protons
SOLUTION:
a) + + + + - -
b) + + + + + + + + + - - - - - - - - - -
c) + + + + + - - - - -
Calculate the value of the force between two charges of 4 μC in vacuum, if the distance between them is 2 m.
Audio:
Classify these object as conductors or insulators:
Indicate what type of material (conductor or insulator) would be adequate to build the following objects:
Choose the circuit element that converts electrical energy into:
a) Read these instructions to a class mate:
"Draw a circuit diagram containing a battery, a motor, an ammeter and a switch"
If there is any symbol that she/he can not remember, describe it for her/him.
Solution:
b) Now he/she has to invent a similar statement with the elements he/she choses for you to draw. And you can receive clues as well if there is a symbol that you don´t remember.
Repeat the exercise one more time each of you, changing the elements.
Read the paragraph below and complete the missing words.
Now try to do the exercise in reverse. Define electromotive force, voltage, intensity and resistance orally, and check, by looking at the solution, that you are able to construct a definition that contains the key words. Record the definitions with your mobile phone. Recording what you want to learn and listen to it while you are walking, cleaning, resting,... is a good trick for memorisation!
Do the problems in your notebook and write the result.
a) Calculate the equivalent resistance of a series circuit with two light bulbs of resistances 1 and 1.25 Ω .
b) Calculate the current that passes through them when they are connected to a 4.5 V battery .
Draw a circuit diagram with a battery, a push button and a light bulb in parallel with a bell. Add a voltmeter to measure the potential difference between the ends of the bulb.
SOLUTION:
a) Calculate the equivalent resistance of a parallel circuit with two 6 Ω resistors .
b) Calculate the intensity that would pass through the circuit battery if it supplies a voltage of 9 V.
c) Calculate the intensity that would pass through each of the resistors .
Talk to your class mate and discuss why the lamps of this circuit bright with different intensity. Afterwards, try to prove your point mathematically.
SOLUTION:
It is a parallel circuit. The higher the resistance in a branch, the less current will circulate through it:
I 1 = V/R 1 = 9/1000 = 0.009 A
I 2 = V/R 2 = 9 /200 = 0.045 A
I 3 = V/R 3 = 9/10 = 0.9 A
Click "retry" to start
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