Connecting Resistors

A wire of resistance (R) is reformed such that its radius increases by 10 %. So, its resistance approximately ………...

• decreases by 9 %

• decreases by 10 %

• decreases by 17 %

• decreases by 32 %

The opposite diagram shows a section of an electric circuit, so the equivalent resistance between the two points x and y equals..................

• 2.5 Ω

• 4.5 Ω

• 6.8 Ω

• 12.3 Ω

The opposite figure shows a part of an electric circuit, so the ratio between the total resistance of the connected set of resistors between the two points x, y before closing switch K and after its closing (𝑹𝟏/𝑹𝟐) is ………..

• 1/2

• 3/4

• 4/5

• 5/6

Two resistors R1 & R2 are connected in parallel then the equivalent resistance for them is 6 Ω, when they are connected in series, the equivalent resistance for them is 27 Ω. Find the value large one.

• 9 Ω

• 18 Ω

• 12 Ω

• 20 Ω

A power station is connected to factory 2.5 km away by two wires the potential difference between the terminals of the wires the station is 240 V and that for the other terminals at the factory 220 V. Calculate the resistance of one meter of the wire if the current flowing through it is 80 A.

• 0.00005 Ω

• 0.00055 Ω

• 0.0001 Ω

• 0.0011 Ω

What is the equivalent resistance between (a) and (b)?

• 3 kΩ

• 6 kΩ

• 9 kΩ

• 12 kΩ

What is the equivalent resistance between (a) and (b)?

• 2 Ω

• 4 Ω

• 6 Ω

• 8 Ω

What is the equivalent resistance between (a) and (b)?

• 5 Ω

• 10 Ω

• 15 Ω

• 20 Ω

What is the equivalent resistance between (a) and (b)?

• 3 Ω

• 7 Ω

• 9 Ω

• 11 Ω

The opposite figure represents a part of an electric circuit, if the equivalent resistance between the points x and y is 8 Ω, the resistance R equals ...

• 4 Ω

• 6 Ω

• 8 Ω

• 12 Ω