0
Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
What does it mean to switch a line out of service or in to service?
To switch is referring to changing the position of. So the line will be de-energized when out of service. and energized while in service.
If a negative current enters a negative voltage will it be negative or positive?
A current is never concidered negative. The current will always flow from a higher voltage to a lower.
For example:
12 -> 0V as 12V is a higher potential than 0V. The current is measured in Ampere.
0V -> -12V as 0V is a higher potential than -12V. The current is measured in Ampere. Not negative Ampere despite the fact that it floats from the 0V potential
AnswerThe term 'negative', in the sense of 'polarity', doesn't apply to either current or voltage (potential difference), although it does apply to potential -so, the previous answer should read that current 'flows from a higher potential to a lower potential', not 'from a higher voltage to a lower voltage'.
However, we do use the terms 'negative' and 'positive' in the sense of 'sense' or 'direction'. So, when we talk about a 'negative voltage', what we mean is a voltage that is acting in the opposite direction to another voltage -for example, if we consider the direction in which a battery's voltage (E) to be acting to be 'positive', then any resulting voltage drop (V) will be acting in the 'negative' direction -i.e. E - V = 0 (i.e. the algebraic sum of the voltages around that circuit is zero).
In the same way, we can describe current as being 'positive' or 'negative' in the sense of its direction. For example, if one current (I1) is approaching a junction, and two currents (I2 and I3) are leaving that junction, we can write: I1 - I2 - I3 = 0 (i.e. the algebraic sum of the currents at that junction is zero).
Unfortunately, this doesn't specifically answer your question which, unfortunately, is rather confusing and needs to be rephrased.
Springs exhibit a physical property known as elasticity. This property allows it to be pushed and pulled easily despite often being made of rather tough materials, because minimal amounts of the material in the spring are actually being pulled and pushed on, but the whole is still moving drastically.
Where exactly is the heater resistor pack located on your 1994 Acura Legend coupe?
HERE IS YOUR ANSWER, PROVIDED BY SOMEONE YOU KNOW, FOR THE BENEFIT OF ACURA OWNERS. BEHIND THE GLOVEBOX, THERE'S A 3 INCH TALL COMPONENT ATTACHED BY SCREWS TO THE WALL. THIS IS AN AUTO TRANSISTOR USED FOR HEATER FAN SPEED. I GOT ONE FROM A JUNK DEALER. THIS THING SITS NEXT TO THE EVAPORATER WHERE ITS COOLED. HOPEFULLY THIS HELPS SOMEONE. I PAID 30 FOR A USED ONE. A NEW ONE FROM THE DEALER ORDERED WOULD BE 156...GOOD JOB ! ....BB
What are the symptoms of a bad voltage regulator?
Undercharging or overcharging the battery are symptoms of a faulty voltage regulator. A typical 12 volt automotive system, engine running at idle, all accessories turned off, should read 14.2 volts at battery connections.
You can't fix it if it's dead you could only buy a new battery. To tita and my nabors zunilda and Natalie oh and evelise and burdo
Would someone be electrocuted if a TV was smashed on their head?
If it's unplugged definatley not. But if it is plugged in, probably not but maybe.
What are the types of SMD Capacitor and Inductor?
capacitr use khte jo apne mea electric curent stor kar k rakhta usmea doo palet lage hotea hai jiske bech kuchalk padhrath jesa daielectric khte hai
How can a magnet be used to create an electric current?
An electrical current will flow in a conductor, when a magnet is moved next to a conductor - or when the conductor is moved next to the magnet.
Where is the heater resistor located on a 1994 Chevy Astro?
The heater resistor on a 94 Astro is located on the top of the heater box under the hood, it has a four or five wire plug on it and two 6mm screws hold it in a hole in the heater blower box.
Can you show me a Design of a circuit to control the brightness of a light bulb using resistors?
What you are refering to is the use of a variable resistor. It has a shaft on it that when turned either clockwise or counter clockwise it dims or brightens the bulb. It does this by proportinally dropping voltage accross itself. However, a better method would be to use a series resonance circuit using an inductor and capacitor. This would dissipate less electrical energy as heat. Unfortunately, I can't send you a jpeg of this here but do a google for resonance and what you need will be there.
What term defines the joining of metallic parts of circuits to establish electrical continuity?
bonding
What happen if you change the position of ammeter in the circuit in parallel and series?
-- In a series circuit, no matter where you install the ammeter,
it will always read the same current.
-- In a parallel circuit, the ammeter may read a different current
when it's moved to a different parallel branch.
What is the formula for Farady's law of electrolysis?
The general equation for Faraday's law of electrolysis is the following: Q = ∫0T I dt,
where,
Q is the total charge moved through the electrode,
T is total length of time the charge was moving,
I is current,
t is time.
Write a program to subtract two 16 bit numbers in microprocessor 8086?
.code
main proc
mov ax,@data
mov ds,ax
lea dx,msg ;printing msg
mov ah,09h
int 21h
mov ax,x ;ax=x
mov bx,y ;bx=y
cmp ax,0 ;jump to l3 if ax is negtive
jb l3
cmp bx,0 ;jump to l6 if bx is negative
jb l6
cmp ax,bx ;if ax<bx,then jump to l1
jl l1
sub ax,bx ;else normal sub
mov diff,ax ;diff=result is stored
jmp l2
l1: ;iff (+)ax<(+)bx
neg bx ;bx=-bx
clc
add ax,bx
neg ax ;-ans=ans
mov diff,ax
mov dx,2dh ;print '-'
mov ah,02h
int 21h
jmp l2
l3: ;iff (-)ax
neg ax ;-ax=ax
cmp bx,0 ;jump to l4 if bx is negative
jb l4
clc
add ax,bx ;ax=(+)ax+(+)bx
mov ax,diff
mov dx,2dh ;print '-'
mov ah,02h
int 21h
jmp l2
l4: ;if (-)ax & (-)bx
neg bx ;-bx=bx
cmp ax,bx ;if ax>bx then jump to l5
jg l5
sub ax,bx ;else ax-bx
mov diff,ax
mov dx,2dh ;print '-'
mov ah,02h
int 21h
jmp l3
l5: ;if(-)ax>(-)bx
xchg ax,bx ;exchange ax and bx
sub ax,bx ;ax-bx
mov diff,ax ;ans is positive
jmp l2
l6: ;iff (-)bx
neg bx ;-bx=bx
add ax,bx ;ax-(-)bx
mov diff,ax ;ans will be positive
mov ah,4ch
int 21h
main endp
A vacuum tube consists of several electrodes (e.g. cathode, grid(s), beam formers, plate). The cathode is kept red hot by a resistance heater so that it emits electrons. Grids, beam formers, etc. control the flow of these electrons from cathode to plate. The plate collects the electrons.
Depending on type of tube and the circuit it is connected to, vacuum tubes can act as: amplifiers, oscillators, modulators, demodulators, mixers, switches, logic gates, pulse shapers, flip-flops, etc.
Solid state components like bipolar transistors, JFETs, and MOSFETs can perform these very same functions as vacuum tubes; but with much less heat, power, voltage, size, and higher reliability. Only in applications where high power is absolutely necessary have vacuum tubes retained dominance (e.g. the cavity magnetron microwave power oscillator tube in microwave cookers).
What does the line below G in galvanometer indicate?
The Underline below symbol G represent about flow of current,if the line is straight it shows direct current,and if it is zig-zag then it is alternate current.
Number of bulbs . . . Load voltage . . . Load current
0 . . . . . . . . . . 120 V . . . . . . . . 0 A.
1 . . . . . . . . . . 117.65 V .. . . . . 23.53 A.
2 . . . . . . . . . . 115.38 . . . . . . . 46.15
3 . . . . . . . . . . 113.21 . . . . . . . 67.92
4 . . . . . . . . . . 111.11 . . . . . . . 88.88
5 . . . . . . . . . . 109.09 . . . . . . . 109.09
Where is the blower resistor located on a 1992 BMW 525i?
Blower resistor is under Drivers' side of center console
What are the three kinds of switching mechanism used in low voltage?
Transistors, relays, and triacs.
What precautions should be observed by people taking zonisamide?
Persons taking zonisamide should avoid alcohol and central nervous system depressants (medications including antihistimines, sleep medications, and some pain medications).
What is the point of a battery?
If you did not have a battery, the circuit would not have any electricity to make a change on something. Basically, a battery is a power source. It creates a difference in charge (positive and negative ends) that causes a flow or electrons through the wire which is electricity!
