Connections in Parallel

Q.

Why in a circuit with resistors in -
• parallel has potential difference constant in whole circuit but not current.
• series has current constant in whole circuit but not potential difference.
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Q. If a bulb and the coil are connected in series with a DC source and iron core put in the coil then the glowing of bulb. 1 )decreases 2) increases 3 )no change 4)zero

Q.

How to guess whether a circuit is in series combination or parallel combination?

Q.

How to distribute current in parallel and series combination?

Q.

Which of the following is/are NOT true about the parallel connection?

1. Every unit that is connected gets an equal amount of voltage

2. Easy to connect or disconnect a new element without affecting the working of other elements

3. As the number of components in a circuit increases, greater will be the circuit resistance

4. Requires less wire compared to the series connection

Q.

If four resistors each of $1\Omega$ are connected in parallel. The effective resistance will be:

1. 2 Ω

2. 4 Ω

3. 0.5 Ω

4. 0.25 Ω

Q. Four cells of emf e and internal resistance r are connected in parallel combination. The equivalent emf of this combination is

Q. A cell of e.m.f. 2 V and internal resistance 1.2 Ω is connected to an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in figure. Find:
a) The reading of the ammeter,
b) The potential difference across the terminals of the cell, and
c) The potential difference across the 4.5 ohm resistor.

Q. What is resistance? What are different types of combination of resistors ? Why is the current flowing across all the resistors connected in series is same ?

Q. Find the ratio of the maximum to the minimum resistance for a combination of 'n' equal resistors.

1. n
2. $\frac{1}{n^2}$
3. $n^2$
4. $\frac{1}{n}$

Q. Why is voltage same in parallel combination of resistors and different in series?

Q.

The equivalent resistance of a circuit that has two equal resistors in series is $8\Omega$. Find the value of each resistor.

1. $8\Omega$

2. $2\Omega$

3. $4\Omega$

4. $1\Omega$

Q.

Which of the following is/are NOT true about the parallel connection?

1. Every unit that is connected gets an equal amount of voltage.

2. Easy to connect or disconnect a new element without affecting the working of other elements.

3. As the number of components in a circuit increases, greater will be the circuit resistance.

4. Requires less wire compared to the series connection.

Q. ntTwo identical cells whether connected together in series or parallel gives same amount of current when connectede to 2ohm external resistance.The internal resistance r is?n

Q.

The equivalent resistance of a circuit that has two equal resistors in series is $8\Omega$. Find the value of each resistor.

1. $4\Omega$

2. $8\Omega$

3. $1\Omega$

4. $2\Omega$

Q.

What is the equivalent resistance in the given circuit?

1. $35\Omega$

2. $560\Omega$

3. $70\Omega$

4. $400\Omega$

Q. How to identify the combinations of resistors are in parallel or series while solving problems ?

Q. five cell of emf E and internal resistance r send the same amount of current through an external resistance E whether the cells are connected in parallel or in series. Then the ratio (R/r) is?

Q.

what is series in electric circuit?

Q.

The equivalent resistance of a circuit that has two equal resistors in series is $8\Omega$. Find the value of each resistor.

1. $8\Omega$

2. $2\Omega$

3. $4\Omega$

4. $1\Omega$

Q.

If n equal resistances are first connected in series and then connected in parallel, the ratio of the maximum resistane to the minimum resistance is

1. n

2. $\frac{1}{n^2}$
   

3. $n^2$
   

4. $\frac{1}{n}$

Q.

In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

1. either less than or more than

2. less than

3. equal to

4. more than

Q. N cells each of emf E and internal resistance r send the same current through an external resistance R whether the cells are connected in series or in parallel. The R=? A) nr B) r C)n /r