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University Physics with Modern Physics

Hugh D. Young, Roger A. Freedman

Physics

14th edition Edition · 1596 pages

ISBN: 9780321973610

Chapter 4: Q16DQ (page 1044)

Can a transformer be used with dc? Explain. What happens if a transformer designed for 120-V ac is connected to a 120-V dc line?

Short Answer

Expert verified

Transformers work only for ac current and if transformer of $120 V$ ac is connected to $120 V$ dc line, the output voltage will be zero.

Step by step solution

01

Step-1: Principal of transformer

The principal of the transformer is based on the induction process, where to induce a voltage in other devices, the current must be varying with time.

02

Step-2: Explanation

As stated, current must be varying with time to induce a voltage in other devices. And the only case when the current varies with time is the AC current, so the transformers work with AC current only.

If a transformer of $120 V$ ac is connected to $120 V$ dc line, the output voltage will be zero, because the change in current is zero.

Hence, Transformers work only for ac current and if transformer of $120 V$ ac is connected to $120 V$ dc line, the output voltage will be zero.

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Most popular questions from this chapter

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. These cyclotrons typically accelerate $H^{-}$ (the hydride ion, which has one proton and two electrons) to an energy of $5 MeV to 20 MeV .$ This ion has a mass very close to that of a proton because the electron mass is negligible about $\frac{1}{2000}$ of the proton’s mass. A typical magnetic field in such cyclotrons is $1.9 T .$ .(a) What is the speed of a $5.0 - MeV H^{-}$ ? (b) If the $H^{-}$ has energy $5 .0 MeV and B =1.9 T$ what is the radius of this ion’s circulator orbit?

A typical small flashlight contains two batteries, each having an emf of $1.5 V$ , connected in series with a bulb having resistance $17 Ω$ . (a) If the internal resistance of the batteries is negligible, what power is delivered to the bulb? (b) If the batteries last for $1.5 h$ what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the current through the filament changes, because this changes the temperature of the filament and hence the resistivity of the filament wire.)

A 1.50- $μ$ F capacitor is charging through a 12.0-Ω resistor using a 10.0-V battery. What will be the current when the capacitor has acquired $\frac{1}{4}$ of its maximum charge? Will it be $\frac{1}{4}$ of the maximum current?

A particle with charge $- 5.60 nC$ is moving in a uniform magnetic fieldrole="math" localid="1655717557369" $B = - (1.25 T) \hat{k}$

The magnetic force on the particle is measured to berole="math" localid="1655717706597" $\overset{⇀}{F} = - (3.40 \times 10^{- 7} N) \hat{i} - (7.40 \times 10^{- 7} N) \hat{j}$ (a) Calculate all the components of the velocity of the particle that you can from this information. (b) Are there
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A $1.50 - m$ cylindrical rod of diameter $0.500 cm$ is connected to

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its ends, while an ammeter measures the current through it. You observe that

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resistivity at and (b) the temperature coefficient of resistivity at for the material of the rod.

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