Is a Wheatstone bridge a device for measuring resistance, voltage or current? In

Question

Is a Wheatstone bridge a device for measuring resistance, voltage or current? In a series (resistance) circuit: a. The voltage drop across each resistance is the same. b. The current through each resistance is the same. c. The equivalent resistance is less than the smallest resistance. d. The current divides between the resistances. In a series circuit, the equivalent resistance is the sum of the individual resistances. Do an example with 3 Resistors with values 10 and 20 and 30 In a parallel resistance circuit the voltage drop is the same across all resistances. In a parallel circuit the equivalent resistance is the reciprocal of the sum of the reciprocals of the individual resistances. Do an example with 3 Resistors with values 10 and 20 and 30 Resistors in parallel will draw more current than if connected in series. A point in a circuit where three or more connecting wires are joined together is called a a. Junction. b. Nodge. c. Three-wire point. d. Split. The sum of the potential differences is zero around a loop. When the current through a resistance is doubled, the joule heat increases by a factor of 4. Two equal resistances are connected in series and then in parallel with the same battery. How does the joule heat of the parallel circuit compare with that of the series circuit? a. The same. b. One-half as great. c. Twice as great. d. Four times as great. The time constant for a100-capacitor and a 5.0-k resistor is? What is the maximum charge stored on the capacitor when it is connected to 6.0 V? How long does it take for a capacitor to pet to a 75% fully-charged? The time constant for a 50-F capacitor and a 15-k resistor is? What is the maximum charge stored on the capacitor when it is connected to 6.0 V? How long does it take for a capacitor to get discharge to a 4.0%?

Explanation / Answer

10)Wheatstone bridge is used to measure the electrical resistance.

11)(b)The current through each resistance is the same.

12)The equivalent resistance in series combination of t3 resistors R1, R2 and R3 is given by

Req = R1 + R2 + R3

Req = 10 + 20 + 30 = 60 Ohm

Hence, Req = 60 Ohm

13)Yes in parallel the voltage across the resistors is same.

14)1/Req = 1/R1 + 1/R2 + 1/R3

1/Req = 1/10 + 1/20 + 1/30 => Req = 5.45 Ohm

Hence, Req = 5.45 Ohm

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