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dimaraw [331]
3 years ago
6

What becomes V if we use 2 resistors of 4W in parallel?

Physics
1 answer:
sdas [7]3 years ago
6 0

Explanation:

The question is incomplete. To get the voltage V across the resistors, we need to total current flowing in the circuit.

Let the current I = 6 A

According to ohms law, V = IRt

V is the total voltage

I is the total current

Rr is the total effective resistance

Since the 2 4ohms resistors are connected in parallel;

1/Rt = 1/4 + 1/4

1/Rt = 2/4

Cross multiply

2Rt = 4

Rt = 4/2

Rt = 2 ohms

Get the voltage V.

V = IRt

V = 6(2)

V = 12V

Hence the required voltage will be 12V

<em>Note that the value of the current used was assumed. The same calculation can be employed for any value of the current</em>

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Find the uncertainty in a calculated electrical potential difference from the measurements of current and resistance. Electric p
german

Answer:

The value is   \Delta V  =  11.5 \ V

Explanation:

From the question we are told that

   The  formula for the Electric potential difference is V =  IR

    The  current is  I  =  9.3 \ A

     The  uncertainty of the current is   \Delta I  =  0.3 \  A

     The  Resistance is   R  =  19.7\ Ohms

       The  uncertainty of the  Resistance is  \Delta R  =  0.6 \ Ohms

Taking the log of both sides of the formula  

          log  V=  log(IR)

=>       log  V=  logI+ logR

differentiating both sides

        \frac{\Delta  V}{V}  =  \frac{\Delta  I}{I} +  \frac{\Delta  R}{R}

Here V is mathematically evaluated as

          V   = 9.3 * 19.7

            V   = 183.21 \  V

So from

       \Delta V  =  V * [\frac{\Delta I}{I} +\frac{\Delta R}{R} ]

        \Delta V  =  183.21  [ \frac{0.3 }{9.3} + \frac{0.6}{19.7}]

=>    \Delta V  =  11.5 \ V

6 0
3 years ago
3. Does a wire with a current running through it
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Answer:

as net charge of a current carrying conductor is zero so no electric field is associated with at.

And

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8 0
3 years ago
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7 0
3 years ago
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7 0
4 years ago
A car is travelling at a speed of 30 m/s. It decelerates at a rate of 12 m/s^2. Calculate the time taken for the car to come to
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Answer:

The answer to your question is: t = 2.5 s

Explanation:

Data

vo = 30 m/s

a = -12 m/s2

t = ?

vf = 0 m/s

Formula

vf = vo + at

Substitution

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Solve it for t           -30 = -12t

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8 0
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