Understanding Household Currents

  • Thread starter Thread starter Gummibare610
  • Start date Start date
  • Tags Tags
    Currents
AI Thread Summary
The discussion centers on the inability to change the potential difference in household currents. It highlights that while household appliances often use transformers to adjust voltage, the overall household voltage remains constant to prevent hazards like fuse ignition from overheating. The example of a laptop operating at 19.5V from a 120V outlet illustrates this concept. The conversation emphasizes the importance of maintaining stable household voltage for safety and functionality. Understanding these principles is crucial for safe electrical usage in homes.
Gummibare610
Messages
4
Reaction score
0
Currents!

Homework Statement


Why can't the potential difference in household currents be changed?


Homework Equations


Conceptual.


The Attempt at a Solution


Is it just because the fuse will ignite if overheated?
 
Physics news on Phys.org


Voltages are changed on household appliances all the time through transformers. For example my laptop runs at 19.5V and the outlet outputs at 120V.
 


Oh ok thanks



Currents FTW
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

How do you Calculate Ampacity of a Conductor Geometry?
2
Replies
64
Views
5K
Why is current constant through a resistor?
Replies
11
Views
1K
Appliance plug connected wrongly: live neutral earth
Replies
13
Views
669
Current flowing in an open circuit
Replies
9
Views
1K
Household currents physics homework
Replies
2
Views
2K
The Direction and magnitude of current in the inductor
Replies
2
Views
2K
Current in a circuit without external resistance
Replies
8
Views
2K
Photoelectric current and a convex lens
2
Replies
56
Views
6K
What happens to the current in a loop when a magnet approaches
Replies
6
Views
2K
How Does Induced Current Change with Loop Acceleration Through a Magnetic Field?
Replies
8
Views
1K

Hot Threads

Recent Insights

Back
Top