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In a step - down transformer having prim...

In a step - down transformer having primary to secondary turn ratio `20:1` the input voltage applied is `250V` and output current is `8A` Assuming `100%` efficiency calculate the
(a) voltage across secondary coil
(b) current in primary coil
(c) power output .

Text Solution

Verified by Experts

`N_(s)/(N_(P)) = (1)/(20) V_(p) = 250 V, i_(s) = 8A`
`(V_(s))/(V_(p)) = N_(s)/(N_(p)) implies V_(s) = (N_(s))/(N_(p)) xx V_(p) = (1)/(20) xx 250 = 12.5V`
`(i_(p))/(i_(s)) = N_(s)/N_(p) implies i_(p) = (N_(s))/(N_(p) )i_(s) = (1)/(20) xx 8= 0.4A`
Power output `= V_(s) i_(s) i_(s) = 12.5 xx 8 =100 W` .
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CP SINGH-ALTERNATING CURRENT-EXERCISES
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  2. The peak voltage in a 220 V AC source is

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  3. An alternating emf given by V = V(0) sin omegat has peak value 10 volt...

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  4. The average emf during the positive half cycle of an ac supply of peak...

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  5. The rms value of an ac of 50Hz is 10A. The time taken by an alternatin...

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  6. An ac ammeter is used to measure currnet in a circuit. When a given di...

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  7. The rms value of the emf given by E = 8 sin omegat + 6 sin 2omegat .

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  8. An AC is given by the equation i=i(1)cos omegat+i(2)sin omegat. The r....

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  9. A direct current of 5 amp is superimposed on an alternating current I=...

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  10. An AC source is rated 220 V, 50 Hz. The average voltage is calculated ...

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  11. The magnetic field energy in an inductor changes from maximum value to...

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  12. An AC source producing emf epsilon = epsilon0 [cos(100 pi s^(-1)) t ...

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  16. An alternating voltage V =200sqrt2 sin 100 t where V is in volt and t ...

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  17. What is the r.m.s. value of an alternating current which when passed t...

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  18. A constant current of 2.8 A exists in a resistor. The rms current is

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  19. Choose the currect option .

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  20. The rms value of potential difference V shown in the figure is

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