Tag: direct current

Questions Related to direct current

An alternating voltage is connected across a series $RLC$ Circuit through an $a.c.$ ammeter. The ammeter reading is the.....

physics magnetic effects of electric current direct current types of current movement of charge

  1. The peak current

  2. The peak current in resonance condition

  3. rms current

  4. zero

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Correct Option: B

The outlets in your home provide.

physics magnetic effects of electric current direct current types of current movement of charge

  1. Direct current

  2. Alternating current

  3. Electric discharge

  4. Static Electricity

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Correct Option: B
Explanation:

The outlets in our home provide alternating current. All our home appliances work on alternating current.

The .... is a current of constant magnitude flowing in one direction.

physics magnetic effects of electric current direct current types of current movement of charge

  1. Direct current

  2. Alternating current

  3. Electro magnetic induction

  4. All

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Correct Option: A
Explanation:

The direct current is a current of constant magnitude flowing in one direction. The source of direct current are the cells.

A cell basically consists of ....... conducting rods.

physics magnetic effects of electric current direct current types of current movement of charge

  1. One

  2. Two

  3. Three

  4. Four

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Correct Option: B
Explanation:

The source if direct current are the cells, In cell, the chemical energy changes into the electric energy when it sends current in a circuit. Cell basically consists of two conducting rods, which are called the electrodes.

A secondary cell can provide______  current.

physics magnetic effects of electric current direct current types of current movement of charge

  1. Low

  2. High

  3. Both

  4. None

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Correct Option: C
Explanation:

Secondary cells can provide low as well as high current. We use lead accumulator battery in a car as it is capable of giving large current. Low current rechargeable cells are widely used in toys and mobile phones.

What will be the reading of a hot wire voltmeter if it is connected across the terminals of a generator whose voltage wave form is represented by 
$V = 200\sin \omega t + 100\sin 3\omega t + 50\sin 5\omega t$?

physics magnetic effects of electric current direct current types of current movement of charge

  1. 100V

  2. 162 V

  3. 150 V

  4. 200 V

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Correct Option: B

Which of the following is wrong?

physics magnetic effects of electric current direct current types of current movement of charge

  1. It is not possible to have electrolysis by a.c.

  2. Ordinary batteries cannot be changed by a.c.

  3. In a circuit containing L, C and R in series across a steady source, poer is dissipated in R, at steady state

  4. For current dirven from a steady source by an ohmic conductor, mean value and r.m.s. value of current will be same

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Correct Option: A

If the instantaneous emf and the instantaneous current equations of an A.C. circuit are respectively 
$e = E _0 sin(\omega t - \pi/6), i = I _0 sin (\omega t + \pi/6)$, then the phase difference between voltage and current is :

physics magnetic effects of electric current direct current types of current movement of charge

  1. $\dfrac{\pi}{3}$

  2. zero

  3. $\dfrac{\pi}{2}$

  4. $\dfrac{\pi}{6}$

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Correct Option: A
Explanation:

Phase of current   $\phi _1 = wt +\dfrac{\pi}{6}$

Phase of emf    $\phi _2 = wt-\dfrac{\pi}{6}$
Phase difference   $\Delta \phi = \phi _1-\phi _2$
$\implies \Delta \phi = (wt+\dfrac{\pi}{6})-(wt-\dfrac{\pi}{6}) = \dfrac{\pi}{3}$

Which of the following is not a chemical cell

physics magnetic effects of electric current direct current types of current movement of charge

  1. Simple voltaic cell

  2. Leclanche cell

  3. Daniel cell

  4. Solar cell

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Correct Option: D
Explanation:

Solar cell is a photovoltaic cell, rest are chemical cells.