A 30.0 ohm resistor and a 51 ohm resistor in parallel are connected to a 120-Vdc

Question

A 30.0 ohm resistor and a 51 ohm resistor in parallel are connected to a 120-Vdc source

What is the voltage drop across the 51 ohm resistor? (V)

A 30.0 ohm resistor and a 37 ohm resistor in parallel are connected to a 120-Vdc source

What is the current through the 37 ohm resistor ? (A)

A different student connects a 10 ohm resistor, a 15 ohm resistor and a 34 ohm resistor in parallel and then connects to a 50-V dc source. How much power is expended in the circuit? (W)

A student connects a 10 ohm resistor, a 15 ohm resistor and a 25 ohm resistor in parallel and then connects to a 50-V dc source. How much current is in the circuit? (A)

Find the force of electrical attraction between a proton and an electron that are 4.8 x 10-11 m apart (the arrangement in the hydrogen atom). (N)

Explanation / Answer

here,

resistance , r1 = 30 ohm

resistance , r2 = 51 ohm

voltage , V = 120 V

equivalent resistance , Req = r1*r2/(r1 + r2)

Req = 30 * 51/(30 + 51)

Req = 18.89 ohm

as the resistance are in parallel

the voltage in parallel is same

then the voltage drop across 51 ohm resistor is 120 V

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