No prize award on nit-picking.
No prize award on nit-picking.
the answer of 172 VA is also incorrect
The current transient for energizing an incandescent lamp is an inverse starting usually 10 or 12 times the steady state value and reaching that value in 10- 20 ms. Bulbs usually fail in that time because the current is high.
Somewhere in inrush current transient the power could have had an instantious value of 1,000 va. There is no way to tell. Conditions before the lights went out are irrelavant and the prize award stands.
The purpose of the problem was when calculating something look over the results and apply the sanity test.
No prize award on nit-picking.
the answer of 172 VA is also incorrect
The current transient for energizing an incandescent lamp is an inverse starting usually 10 or 12 times the steady state value and reaching that value in 10- 20 ms. Bulbs usually fail in that time because the current is high.
Somewhere in inrush current transient the power could have had an instantious value of 1,000 va. There is no way to tell. Conditions before the lights went out are irrelavant and the prize award stands.
The purpose of the problem was when calculating something look over the results and apply the sanity test.