- #1

predentalgirl1

- 67

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**A 120-V circuit has a circuit breaker rated to trip (to create an open circuit) at 15 A. How many 300-ohm resistors could be connected in parallel without tripping the breaker?**

**Given that,**

V= 120V, I = 15A, R= 300 ohm.

Let the total resistance without tripping the breaker = Rp

Now 1/Rp = 1/R + 1/ R + ………n times.

= n/R

Therefore Rp = R/n

Or n = R/ Rp

But Rp = 120/15

= 8

Therefore n = 300/8

= 37.5=38

Is this correct?

V= 120V, I = 15A, R= 300 ohm.

Let the total resistance without tripping the breaker = Rp

Now 1/Rp = 1/R + 1/ R + ………n times.

= n/R

Therefore Rp = R/n

Or n = R/ Rp

But Rp = 120/15

= 8

Therefore n = 300/8

= 37.5=38

Is this correct?