Voltage and current relation, Ohm’s law use in Hindi

Voltage and current relation, Ohm’s law use in Hindi


Today, I will explain, If voltage increases, then current will increase, or decrease, or will remain same, Many persons ask me, in some videos, you tell current will increase, In other video, you tell that current will decrease, so I will tell today, where will current increase, and where will current decrease, Here, A load R is connected across AC supply, Value of R is 1 Ohm, V is the voltage across R, current flowing is I, so V/I=R, this is Ohm’s law, now suppose voltage is 10 Volts, then 10 amps current will flow, and 10/10=1 Ohm will come, Now If we increase the voltage, 10 become 20, then current will also increase, but V/I, 20 volts, divided by 20 amps, will still come 1 ohm. if, we reduce this voltage to half, then current also will becomes half, and this ratio still will be 1, as value of resistance is 1 Ohm. so , when this resistance or load is fixed, then if voltage increases, then current also will increase. and current will decrease at less voltage, and Ohm’s law is always followed, now suppose, a transformer is connected, between supply & load, now in case of calculation with transformer, we use formula of power, power is V multiply by I, if power is calculated here, voltage will be this, and current will be this, if power is calculated here, then this voltage, and this current will be taken, now suppose, 10 volts is here, as it was earlier here, and 10 Amps current I is flowing, as it was 10 amps earlier, so how much power?, 10 multiply by 10, 100 watts, resistance is still 1 ohm as earlier, so 10 volt voltage, and 10 amp current, multiplication will be 100, this calculation is valid here, now suppose, voltage at this side is more, voltage at this side, becomes 50 volts from 10 volts, now what will happen?, as power is same, here also 100 watts, here also 100 watts, it can be that, power here is 100 watts, but here power is 150 or 50 W, power remain same, voltage becomes 50 from 10, current will have to be less, so current will be less here, voltage become 50 from 10, current become 2 from 10 amps, now 50 Volts multiply by 2 amps, power will come 100 watts, now if voltage increases further, voltage is 100 V now, then current will reduce further, and multiplication of voltage & current, will give power as per formula, see, this formula is followed even now, this formula is derived from ohms law, but there is difference between this & this, here, if we increase the voltage, current also will increase, here, if voltage increases, then current decreases, the reason for this is, if V & I calculation is done for transformer, between secondary and primary, in such calculation, power remain same, if power remain same, then for higher voltage in primary, current in primary will be less, secondary voltage & current, will not change, if we increase turn ratio, (more primary turns), turns are increased here further, by keeping turns constant here, current will reduce here further, ( as voltage is more), as voltage is increasing here, current here will go on reducing, so, wherever resistance is fixed, and we calculate with resistive load, then current increases with voltage increase, and formula used is R=V/I, but in the case of transformer , then we consider power, this side power, and this side power is equal, that time, multiplication of P & I remains constant. so with increase in voltage, current will start decreasing, so this formula is also working, and this formula is also working, both the formulas are working, here, a UPS is shown, input of UPS is AC, and UPS is charging a battery, Good quality UPS, keep the charging current constant, if current is required to be changed, then also current will be fixed ( with time), only setting will change like 10 A or 5 A, if voltage is changing, or with change in battery voltage, this charging current will not change, so, in this case, if voltage is increasing, current will neither increase, current will not reduce with less in voltage, current remains fixed, but Ohm’s law is still followed here, V/R=I, now if voltage increases, current is same, then how can it possible?, only way is, that R is increased, so function of UPS (in this case) is, drop in side the UPS here, or equivalent resistance inside (in series), will change with voltage, such that, current remains constant here, Now I am showing a simple charger, this is AC supply, this is rectifier, there is a resistor in series, and battery is charging, Ohm’s law is followed here also, the current here, is controlled / limited by this resistor, but what happens?, If resistance is fixed here, then current increases with increase in voltage, but Ohm’s law is always followed, I told you 3 points so far, 1st point, in this case, with increase or decrease in voltage, current will neither increases, nor decreases, current remains same (constant), 2nd point told, was, if resistance is fixed, and we are calculating for resistance, then with increase in voltage, current will increase, and with decrease in voltage, current will decrease, 3rd point was, if we calculate for transformer, then, primary & secondary of the transformer, will have same power, that time, V X I is power, and with increase in voltage, current decreases, this happens in primary, as voltage increases here, current will go on reducing, but power remains same, now, i will tell you, some more points about power, there is a equipment here, this is input supply, and a load is connected at output, this is Ohm’s law, this is always followed, power flowing here is P, power flowing here is load power, I have written it as P load, and one more type of power is there, that is called P loss, P loss is the power loss inside it, power flowing here, plus, this power, P load plus P losses here, will be equal to input power, this may be possible, that load is fixed, but power P is changing here, this P load is fixed, this P is changing, that is possible, if, P losses are changing, if voltage is changing here, then equipment losses may change, that time, power formula will be, P=Power loss + Power load, now suppose, this equipment, is a mobile charger, this is input of the mobile charger, this is the output, mobile is connected at this output, this full inside, is this, you must have seen in charger, that output power written is very less, but input power written is very high, these 2 input & output will not be equal, this input power is more, why? due to power loss, there is power loss inside the charger, that also comes from input power, I have made a video on this, you can watch that, what are these equipment ?, I will tell few examples, like, battery charger, UPS, fan, motor, induction heater, vacuum cleaner, washing machine, bulb, whatever is here, this ohm’s law is always followed, if you feel, that Ohm’s law is not followed, this does not mean, that Ohm’s law is wrong, Ohm’s law is always correct, but our knowledge is less, we need to learn more, then you should learn more, this formula is always correct, many places, what happens, like in motor, induction heater, in vacuum cleaner, or in washing machine, there is no R connected, Have you seen R there? NO, that me load due to air, or load due to water, or some other type of load, but bulb has R type load, so all these loads, have some equivalent resistance, power P load flow according to that, plus, there will be losses also, then we get total power, OK ?, Now in case of the bulb, many has asked me, that Ohms law is not followed here, Formula is always followed, when bulb is cold, then value of R is very less, Current I will increase due to less R, but, when bulb becomes ON, then filament will be very hot, then value of R increases, so current will reduce, It happens because, value of R is changing, but you feel, that formula is not followed, formula is always followed, we will close now,

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100 thoughts on “Voltage and current relation, Ohm’s law use in Hindi

  1. In DC current ,
    Current will increase if voltage increase
    But in AC current ,
    Current will decrease if voltage increases.

  2. Inductor or transformer coil not follow ohm law MATLAB ki V ke increase i increase nhi hoga Issi liye V and i are inversely proportional so voltage or current ghatega ya badhega power ko constant rakhne ke liye

  3. सर जी यदि हम लैपटॉप के 65 वाट कि जगह 90 वाट लगाएंगे तो लैपटॉप के नुकसान होगा या नहीं और एम्पियर 3.25 कि जगह ज्यादा एम्पियर का चार्जर लगाएंगे तो क्या होगा रिप्लाई जरूर दे

  4. main staplaizer se jab hum ghar ka supply dete hai, tab kya poll ka line kam hoti hai ,yaa nahi,,,yaa pure staplizer line khich leti hai,,

  5. Sir battery ki full video bnaiya jisma constant and current method bi ho please sir pleaseeeee eeeeeeeeeeeeeeee reply sir 🤗🤗🤗🙏🙏🙏🙏😭😭😭

  6. वोल्टेज बढ़ाने से करेंट कम होता है ठीक है

  7. Given (all in volts) V1=20 cos wt
    V2= 10 cos(wt-225), V3= 10 cos(wt+ 270),
    Find V = V1 + V2V3=?
    Sir iska solution

  8. Sir plz clear the transformer vactor grup and how many vactor group in transformer
    How to know different type vactor group testing conditions

  9. Why are you confusing people.you are taking many principles simultaneously in the name of ohms law.Ohms law ,Magnetic law and Non linearity (UPS).

  10. Bahut bahut shukriya sir,
    Yeh doubt toh mujhe ek saal se tha
    Aapne 10 min me clear kar Diya
    Heartly thanks..

  11. Hello sir…hum slum area me rahte hai abhi filhal single wire se ham current le rahe hai but fan bahot zada slow hai arthing lagane ke bawjud ….to mujhe tarika batye ki Mai current flow kaise badha sakta hoo transformer banana padhega yaa Koi or tarika please……Koi hai jankar….?

  12. thank you sir , aapka yogdaan aane waale kai generation ko help karegi , aapka gyaan chaand suraj ki tarah , prakaashit hoga . pranaam.

  13. Kya bole sir, apke samajhane ka tarika jabardast hei, ek stupid bhi Samajh lega, nit n clean explanation. Aapka jaisa sir to school ke foundation level mein hona chahiye toh har student electrical ko achcha se samjhega. Take respect sir 🙏

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