anonymous asked:

Might be a dumb question: But why charger always heat up? Thanks !

Not a dumb question at all. Imagine the charger to be this conversion box :

The only problem being that the efficiency of this conversion from AC to DC is only ~ (80-85)%.

The rest of the energy is lost due to the resistance offered by the wires and transistors which gets reflected as heat or I2R loses. So, higher the resistance, more the loss.

Thanks for asking !

Lightning Moon

When she gets angry
Her voice cracks
She often plays heavy metal music
Dances like a wild woman
Howls like a banshee

I can feel her from miles away
Her energy is contagious

But there are summer nights
Warm and rare and calm
Where she hums to herself
Such peaceful songs

I become transfixed by her beauty
Settled and unafraid

Azuki Lynn


1.27.17 | 11:05 AM
4 days to go before my final physics exam worth 40% of my mark! The semester has been a rough one, my mark went from 98 to 87 and if I want a 90, I’ll have to get at least a 95 on the exam so wish me luck!

Also, pertaining to my electricity test, I got 42/50, which is granted not my best work, but I’ll keep trying! ♡

Don’t be too hard on yourself okay? Marks really aren’t everything, I’m just competing with myself.

anonymous asked:

Hola ur blog is so cool and I think it's really cool you like to help people. I'm a bit confused on what power is in a circuit and it's relationship to current, resistance, and voltage... can you help explain? Tysm!!

The Hydraulic Analogy

There are a couple of times especially in engineering where it is easier to think of DC electric circuits in terms of hydraulic circuits and vice versa. And I think in this case it might help you as well.

Current: The amount of water flowing through a section of a pipe over time

Voltage: The difference in pressure between two points in the water circuit.

Resistance: Narrow constrictions offer high resistance and every pipe like every other wire offers resistance to the flow of water.

Power: It is the rate at which the energy stored in the water is used to drive a mechanical device like a water wheel.

Think of it like this: How fast the wheel is going to spin is dependent on the amount of water hitting it (current) and how much pushing this quantity of water does (voltage). 

(pressure = force applied / area)

Hope this helps and I am glad that you are finding the blog to be useful. Cheers!

* More about the water analogy for electric circuits

** Where does this analogy fail ? (Very important to know)