1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vladimir1956 [14]
3 years ago
8

In this circuit (see picture), which resistor will draw the least power?

Physics
1 answer:
Basile [38]3 years ago
3 0
A few different ways to do this: 

Way #1: 
The current in the series loop is  (12 V) / (total resistance) . 
(Turns out to be 2 Amperes, but the question isn't asking for that.)

In a series loop, the current is the same at every point, so it's
the same current through each resistor.

The power dissipated by a resistor is  (current)² · (resistance),
and the current is the same everywhere in the circuit, so the
smallest resistance will dissipate the least power.  That's  R1 .

And by the way, it's not "drawing" the most power.  It's dissipating it.

Way #2:
Another expression for the power dissipated by a resistance is

                 (voltage across the resistance)²  /  (resistance)  .

In a series loop, the voltage across each resistor is

          [ (individual resistance) / (total resistance ] x battery voltage.

So the power dissipated by each resistor is

         (individual resistance)² x [(battery voltage) / (total resistance)²]

This expression is smallest for the smallest individual resistance.
(The other two quantities are the same for each individual resistor.)
So again, the least power is dissipated by the smallest individual resistance.
That's R1 .                                      

Way #3:  (Einstein's way)
If we sat back and relaxed for a minute, stared at the ceiling, let our minds
wander, puffed gently on our pipe, and just daydreamed about this question
for a minute or two, we might have easily guessed at the answer.

===>  When you wire up a battery and a light bulb in series, the part
that dissipates power, and gets so hot that it radiates heat and light, is
the light bulb (some resistance), not the wire (very small resistance).
You might be interested in
How do you get DC current and AC current? from a generator?
grin007 [14]

Answer:

They do that by converting rotating mechanical energy into electrical power. Portable generators use an engine—typically running on gasoline, diesel, or propane, to turn an alternator which produces alternating electrical current or AC.

5 0
3 years ago
The simple sugar made during photosynthesis is called _____.
Andre45 [30]

Answer:

glucose

Explanation:

3 0
3 years ago
Read 2 more answers
_____ analyzes the interaction of low-frequency sound waves with tissues to create moving images of internal organs.
Degger [83]

Answer: Ultrasound

Explanation:

4 0
3 years ago
When the distance between two objects doubles, what happens to the gravitational attraction between these two objects?
Feliz [49]

Answer:

As indicated by Newton's law of attraction each article or body in the universe draws in every single item towards one another and that power of fascination is straightforwardly relative to the result of their masses and contrarily corresponding to the square of the distance between them.  

The power of gravity between two articles will diminish as the distance between them increments. The two most significant elements influencing the gravitational power between two items are their mass and the distance between their focuses. As mass increments, so does the power of gravity, however an increment in distance mirrors a reverse proportionality, which makes that power decline dramatically.  

At that point by Newton's All inclusive Law of Attractive energy;  

F=GMm/R^2  

Mm= result of the majority  

R=Distance Between the two masses by focus.  

On the off chance that R is multiplied, new force=GMm/(2R)^2  

=GMm/4R^2  

Unique Power/New Force=4/1  

F/4=New Power

8 0
3 years ago
What is energy efficiency
astra-53 [7]

Answer:

the easiest and most cost effective ways to combat climate change, clean the air we breathe, improve the competitiveness of our businesses and reduce energy costs for consumers.

Explanation:

6 0
3 years ago
Other questions:
  • Perpendicular parking spaces require turning at a ______-degree angle.
    12·1 answer
  • Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric
    5·1 answer
  • Can an object reverse its direction of travel while maintaining a constant acceleration?
    12·1 answer
  • A switch is connected in a series circuit. If the contacts on the switch are opened, the resistance of the circuit (including th
    6·1 answer
  • An engine exhausts 1140 j of energy for every 3790 j of energy it takes in. what is its efficiency?
    11·1 answer
  • How do butterfly dest on there wings
    14·1 answer
  • When you mix two substances, the heat gained by one substance is equalto the heat lost by the other substance. Suppose you place
    14·1 answer
  • 6. Show that the weight of an object on the moon is 1/6 its weight on earth.​
    12·1 answer
  • How can mindfulness meditation help you with your well-being?
    5·1 answer
  • How much force is needed to accelerate a 7.1 kg skier at 4 m/s/s?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!