All categories

3 years ago

How do you calculate elecrical power?

Physics

2 answers:

maw [93]3 years ago

6 0

Appreciated it if you mark me brainliest!

Answer:

The formula P= U I

Explanation:

Power is usually defined as energy divided by time, P=E/t so energy is power times the time.

Good luck!

horsena [70]3 years ago

3 0

By ohm’s law and v=IR

You might be interested in

What is photosynthesis

Viktor [21]

Answer:

photosynthesis is the process by which plant prepares food using carbondioxide and water in the presence of sunlight

8 0

3 years ago

Read 2 more answers

A car is stopped at a traffic light. When the light turns green at t=0, a truck with a constant speed passes the car with a 20m/

s344n2d4d5 [400]

Answer:

At $t = (70 / 3) \; {\rm s}$ (approximately $23.3 \; {\rm s}$ .)

Explanation:

Note that the acceleration of the car between $t = 0\; {\rm s}$ and $t = 20\; {\rm s}$ ( $\Delta t = 20\; {\rm s}$ ) is constant. Initial velocity of the car was $v_{0} = 0\; {\rm m\cdot s^{-1}}$ , whereas $v_{1} = 35\; {\rm m\cdot s^{-1}}$ at $t = 20\; {\rm s}\!$ . Hence, at $t = 20\; {\rm s}\!\!$ , this car would have travelled a distance of:

$\begin{aligned}x &= \frac{(v_{1} - v_{0})\, \Delta t}{2} \\ &= \frac{(35\; {\rm m\cdot s^{-1}} - 0\; {\rm m\cdot s^{-1}}) \times (20\; {\rm s})}{2} \\ &= 350\; {\rm m}\end{aligned}$ .

At $t = 20\; {\rm s}$ , the truck would have travelled a distance of $x = v\, t = 20\; {\rm m\cdot s^{-1}} \times 20\; {\rm s} = 400\; {\rm m}$ .

In other words, at $t = 20\; {\rm s}$ , the truck was $400\; {\rm m} - 350\; {\rm m} = 50\; {\rm m}$ ahead of the car. The velocity of the car is greater than that of the truck by $35\; {\rm m\cdot s^{-1}} - 20\; {\rm m\cdot s^{-1}} = 15 \; {\rm m\cdot s^{-1}}$ . It would take another $(50\; {\rm m}) / (15\; {\rm m\cdot s^{-1}}) = (10/3)\; {\rm s}$ before the car catches up with the truck.

Hence, the car would catch up with the truck at $t = (20 + (10/3))\; {\rm s} = (70 / 3)\; {\rm s}$ .

3 0

2 years ago

A particle with charge -5 C initially moves at v = (1.00 i^ + 7.00 j^ ) m/s. If it encounters a magnetic field B =80 Tkˆ, find t

algol [13]

Answer:

The magnetic force is $\= F = 400\r j + 2800\r i$

Explanation:

From the question we are told that

The charge is $q = -5C$

The velocity is $v = (1.00\ \r i + 7.00 \ \r j )\ m/s$

The magnetic field is $B = 80 \r k \ \ T$

Generally the magnetic force is mathematically represented as

$\= F = q \= v \ \ X \ \ \= B$

=> $\= F = -5 (1.0 \r i + 7.0 \r j ) \ \ X \ \ 80 \r k$

=> $\= F = -5.0 \r i + 35\r j \ \ \ X \ \ 80\r k$

=> $\= F = 400\r j + 2800\r i$ N/B - Applied cross - product of unit vector

8 0

4 years ago

Can someone help me with this question?

soldier1979 [14.2K]

Explanation:

force = mass × acceleration

Solving for acceleration:

acceleration = force / mass

To find the acceleration, divide each force by the mass. For example:

a = 480 N / 62 kg

a = 7.74 m/s²

8 0

4 years ago

If the sign of work is negative,

aivan3 [116]

If the sign of work is negative, that means the force and the motion are in opposite directions.

Let's say you see something roll off of the shelf. You catch it, and you let it down slowly and gently.

Gravity exerted down-force on it and it moved down. Gravity did positive work on it.

YOU exerted UP-force on it and it moved down. YOU did negative work on it.

(Also, the falling object exerted down-force on your hand, and your hand moved down. The falling object did positive work on your hand ! Where did THAT energy come from ? It came from the potential energy that the object had while it was on the shelf. Your hand absorbed that energy on the way down, doing negative work. So the object didn't have any kinetic energy when it reached the floor, and it did NOT splinter the floor or shatter in smithereens. It had barely enough energy left to make a sound when it hit the floor.)

5 0

3 years ago

How do you calculate elecrical power?​

How do you calculate elecrical power?