Describe the alloyed junction method of forming a semiconductor.
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The alloyed junction method of forming a semiconductor is extremely simple. A small pellet of trivalent material, such as indium, is placed on an N-type semiconductor crystal. The pellet and crystal are heated until the pellet melts and partially fuses with the semiconductor crystal. The area where the two materials combine forms the P-type material. When the heat is removed, the material recrystallizes and a solid PN junction is formed.
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Consideration is being given to increasing the toll on a bridge now carrying 4500 veh/day. The current toll is $1.25/veh. It has been found from past experience that the daily traffic volume will decrease by 400 veh/day for each 25ยข increase in toll. Therefore, if x is the increase in toll in cents/veh, the volume equation for veh/day is V = 4500 - 400 (x / 25) , and the new toll/veh would be T = 125 + x. In order to maximize revenues, what would the new toll charge be per vehicle and what would the traffic in veh/day be after the toll increase?
What will be an ideal response?
What are the two main types of hydroponic systems used to grow plants?
What will be an ideal response?
An electrician is testing a circuit where a single-pole switch controls an LED lighting fixture in a bedroom. When the single-pole switch is toggled ON, the lighting fixture does not come on. Which of the following items could not be a cause for this?
a. there is an open grounding path b. the circuit breaker protecting the circuit is off c. there are no lamps installed in the lighting fixture d. the connections to the lighting fixture are not making a good connection
Given: A transformer has 200 turns in the primary, 100 turns in the secondary, and 150VAC applied to the
primary. What is the voltage across the secondary? a. 75VAC b. 90VAC c. 120VAC d. 140VAC