66.7 Watts
Explanation:
Let 
ohms, 
ohms and 
ohms. Since 
and 
are in parallel, their combined resistance 
is given by
or
The total current flowing through the circuit <em>I</em> is given
where
Therefore, the total current through the circuit is
In order to find the voltage drop across the 6-ohm resistor, we first need to find the voltage drop across the 1-ohm resistor 
:
This means that voltage drop across the 6-ohm resistor 
is 20 V. The power dissipated <em>P</em> by the 6-ohm resitor is given by
Answer:
<em>The actual dimensions of the classroom are 50 cm x 70 cm</em>
Explanation:
<u>Scaling
</u>
When we need to represent real-world dimensions into small spaces, we use scaling. Distance scaling tells us what is the equivalence between the real units and the scaled units. In this case, we are told that 10 cm is equivalent to 1 meter. As 1 meter is 100 cm, it means that the scale is 100/10=10. Thus, each centimeter in the paper is equivalent to 10 cm in the real distance.
The classroom is 5 cm x 7 centimeters. Scaling back to the real values, the classroom has measures of 50 cm x 70 cm.
