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A 15 A current flows in a device that has a resistance of
0.15Ω. Compute the rate of heat production by the device.
The heating element in a hair dryer is rated at 5kW and
220V . How much current does it draw?
An electric toaster has a resistance of 12 Ω. What current will it draw
from a 120 V supply?
What is the potential difference across a hand-held fan that has a
resistance of 120 Ω and a current of 50 mA flowing through it?
What is the resistance in a circuit if a potential difference of 110 V
causes a current of 10 A?
You are taking a test to see if you have supernatural abilities that involves a deck of five cards that each show one of five symbols (which we will call (A, B, C, D, E)). The cards are placed in a sequence so that each card appears exactly once; no repeats are allowed. Your job is to guess the correct sequence. (a) How many different sequences are possible? (b) What is the probability that you guess all five cards in the sequence correctly? (c) What is the probability that the letters AB occur consecutively and in that order some where in the sequence?
Calculate the current an electric clothes dryer draws when it is
connected to a 230 V source and has a resistance of 9.2 Ω
A conductor has a diameter of 3.0 mm. How many meters of this
material is needed to have a resistance of 1ohm? The resistivity of the
conductor is 1.68 x10−8 Ω. m
You are taking a test to see if you have supernatural abilities that involves a deck of five cards that each show one of five symbols (which we will call (A, B, C, D, E)). The cards are placed in a sequence so that each card appears exactly once; no repeats are allowed. Your job is to guess the correct sequence. (a) How many different sequences are possible? (b) What is the probability that you guess all five cards in the sequence correctly? (c) What is the probability that the letters AB occur consecutively and in that order some where in the sequence?
Each time you visit the state fair, you play some games at the Midway. One game has four prizes (A, B, C, D). (a) How many different four letter sequences are possible if each letter is chosen from {A, B, C, D} with repeats allowed? (b) How many different four letter sequences have each letter occurring exactly once? (c) How many different four letter sequences don't contain B? (d) How many different four letter sequences have two letters, each of which occurs twice?
#340153 on Dec 2023