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.
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.
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).
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