To determine how long a breaker will take to trip at a given current, find the level of current on the bottom of the graph. Draw a vertical line to the point where it intersects the curve. Then draw a horizontal line to the left side of the graph and find the time to trip.
Full Answer
How do you calculate electrical current from charge and time?
Electrical current is defined by how much electric charge has been transferred per second, giving the following relationship: \ [current=\frac {charge} {time}\] Rearranging this we get: \ [charge = current \times time\] The symbol for charge is \ (Q\), it is measured in coulombs (\ (C\)).
How does a time-current curve work?
The following illustration shows how a time-current curve works. The figures along the bottom (horizontal axis) represent current in amperes. The figures along the left side (vertical axis) represent time in seconds. To determine how long a breaker will take to trip at a given current, find the level of current on the bottom of the graph.
How do you find the trip time of a circuit breaker?
To determine how long a breaker will take to trip at a given current, find the level of current on the bottom of the graph. Draw a vertical line to the point where it intersects the curve. Then draw a horizontal line to the left side of the graph and find the time to trip.
What is the relationship between current charge and time?
Current, charge and time Electrical current is defined by how much electric charge has been transferred per second, giving the following relationship : [current=frac{charge}{time}]
What is the formula to calculate time?
To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.
What is the formula for time of travel?
To solve for time, divide the distance traveled by the rate. For example, if Cole drives his car 45 km per hour and travels a total of 225 km, then he traveled for 225/45 = 5 hours.
What is the formula to find time in simple interest?
Simple Interest is an easy method of calculating the interest for a loan/principal amount....Simple Interest Formula For Months.TimeSimple interest FormulaExplanationYearsPTR/100T = Number of yearsMonths(P × n × R)/ (12 ×100)n = Number of monthsDays(P × d × R)/ (365 ×100)d = Number of days (non-leap year)
What is the formula for rate distance and time?
Many everyday problems involve rates of speed, using distance and time. We can solve these problems using proportions and cross products. However, it's easier to use a handy formula: rate equals distance divided by time: r = d/t.
How do you calculate time without distance?
Very simple: Sum each speed multiplied by time travelled at that speed and divide this sum of the total traveling time: eg. you travelled 90 km/h for 2 hours, 80 km/h for 1 hour and 60 km/h for 1.5 hor, your average speed is (90×2 + 80×1 + 60×1.5) / (2+1+1.5) = 350 km / 4.5 hours = 77.8 km/h average speed.
Is time travel mathematically possible?
"People think of time travel as something as fiction. And we tend to think it's not possible because we don't actually do it," said theoretical physicist and mathematician, Ben Tippett, from the University of British Columbia in Canada. "But, mathematically, it is possible."
How do you find time when given interest rate and principal?
Time = (100 × Interest)/(Principal × Rate) = 6. Therefore, Time (T) = 6 years.
How do you find time when given the rate and principal?
r and t are in the same units of time.Calculate Interest, solve for I. I = Prt.Calculate Principal Amount, solve for P. P = I / rt.Calculate rate of interest in decimal, solve for r. r = I / Pt.Calculate rate of interest in percent. R = r * 100.Calculate time, solve for t. t = I / Pr.
How do you calculate distance and time examples?
1:2510:40Velocity - speed, distance and time - math lesson - YouTubeYouTubeStart of suggested clipEnd of suggested clipOkay over time this might be miles. Per hour or something like this so I'm going to write ourMoreOkay over time this might be miles. Per hour or something like this so I'm going to write our formula down here speed is equal to now rub there. So we do this with a sight distance.
How do you solve time problems?
0:1513:124th Grade Math 12.9, Word Problem Solving Elapsed Time - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe can use the strategy draw a diagram by making a timeline to solve elapsed time problems aMoreWe can use the strategy draw a diagram by making a timeline to solve elapsed time problems a timeline helps us count the number of hours and minutes of the elapsed.
Calculating Values in a Reactive DC Circuit
The first step is to identify the starting and final values for whatever quantity the capacitor or inductor opposes the change in; that is, whatever quantity the reactive component is trying to hold constant. For capacitors, this quantity is voltage; for inductors, this quantity is current.
Using the Universal Time Constant Formula for Analyzing Inductive Circuits
The universal time constant formula also works well for analyzing inductive circuits. Let’s apply it to our example L/R circuit at the beginning of the chapter:
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