The point is that for the same amount of work, power and time are inversely proportional. The power equation suggests that a more powerful engine can do the same amount of work in less time.
What happens to power if time increases?
Hence, as time taken increases, power decreases.
What factors affect power physics?
If work is done faster, power is higher. If work is done slower, power is smaller. Since work is force times displacement (W=F*d), and velocity is displacement over time (v=d/t), power equals force times velocity: P = F*v. More power is seen when the system is both strong in force and fast in velocity.
What is the relationship between power and time?
With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules. A watt is one joule divided by one second.
What happens to the power used when the time is shorter?
Power is defined as the quotient of work and time, or P = W/t. Thus, if the work is increased and the time is decreased, the power will be increased.
Does energy depend on time?
∴ U(r,t) = k q Q(t) /r i.e., the potential energy depends on time. § When the force on a particle depends on time, energy is not conserved.
What happens to power produced if more work is done in the same amount of time?
Power is inversely proportional to time. Given that work is constant, performing the same amount of work in less time produces a greater power output.
Is power affected by mass?
More work is done when mass increases. Therefore the power increases as well.
What is the relationship between work and power?
2 Answers. Work is the energy needed to apply a force to move an object a particular distance, where force is parallel to the displacement. Power is the rate at which that work is done.
Does speed equal power?
Power is defined as the product of Force and Speed.
What are the factors affecting power of a source?
Answer: Characteristics that affect power quality are voltage fluctuation, harmonic distortion, voltage unbalance, flicker, supply interruptions, voltage sags, voltage swells and transients etc.
Power: Power requirement is directly proportional to cube of the speed.
Do force and time have direct relationships?
From Equation 1, force is inversely proportional to time.
What are the 3 formulas for power?
- P = E t.
- P = W t.
- P = V 2 R.
How is power defined in physics?
power, in science and engineering, time rate of doing work or delivering energy, expressible as the amount of work done W, or energy transferred, divided by the time interval t—or W/t.
Why is electricity cheaper at night?
Off-Peak Electricity Times. Off-peak times vary slightly depending on the supplier, but they are usually between 10pm and 8am. This is when the least energy is taken from the grid and so energy suppliers can afford to offer cheaper prices.
What time is electricity the cheapest?
Electricity is often cheaper late at night or early in the morning, so those will be the times when you can save money on your electric bill. This is because these are typical off-peak hours when not as many people are using electricity.
Is power same as energy?
Energy is the capacity to do some physical activities or work, such as running, jumping, etc., while power is defined as the rate at which the energy is transferred, or the work is completed. The unit used to measure energy is joules, ergs and calories. Power is measured in watts.
Why does energy not depend on time?
Energy spent does not depend on time but power depends on time in which the energy is spent.
What is the difference between work and power in physics?
Work is the energy needed to apply a force to move an object a particular distance. Power is the rate at which that work is done.
What is difference between work energy and power?
Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.
How do you find power with work and time?
How do you calculate time from power and work? Since power is the amount of work per unit time, the duration of the work can be calculated by dividing the work done by the power.
Does it take more power to climb stairs quickly or slowly?
The faster you climb the stairs, the more power you will develop.
What is the relationship between work and energy in physics?
Thus, the work-energy theorem states that: The net work done by the force on an object is equal to the change in its kinetic energy.
What is the relationship between power and mass?
The power is equated in relation to the mass flow rate, P = m° w. The power is product of the mass flow rate and specific work. The unit of power is m3/s *N/m2.