On an electrical plug with three prongs, the third prong is the _____.
a. neutral contact
b. circuit breaker
c. grounding conductor
d. safety prong
c. grounding conductor
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Answer the following statement(s) true (T) or false (F)
A suspended ceiling system consists of panels that are laid into a metal grid.
A(n) ____________________ switch is used to control a 240-volt load, such as a water heater, in a residential wiring system.
Fill in the blank(s) with the appropriate word(s).
Polychlorinated biphenyls (PCBs) are a group of synthetic oil-like chemicals that were at one time widely used as insulation in electrical equipment and were discharged into rivers. They were discovered to be a health hazard and were banned in the 1970s. Since then, much effort has gone into monitoring PCB concentrations in waterways. Assume that water samples are being drawn from a waterway in order to estimate the PCB concentration.
a. Suppose that a random sample of size 80 has a sample mean of 1.69 ppb and a sample standard deviation of 0.25 ppb. Find a 95% confidence interval for the PCB concentration. b. Estimate the sample size needed so that a 95% confidence interval will specify the population mean to within ±0.02 ppb.
If an electric heater is rated at 15,000 W, and the voltage used is 240 V, what size breaker in amps would be required?
A) 62.5 B) 140 C) 75 D) 50