# Can you have negative average power?

## Can you have negative average power?

Can the average power output be negative? It may be negative, because power might be absorbed at some instant. However, average power output over a cycle cannot be negative. It is usually positive or may be zero such as in LC circuit.

### Why is AC power always positive?

AC resistor circuits Because the resistor simply and directly resists the flow of electrons at all periods of time, the waveform for the voltage drop across the resistor is exactly in phase with the waveform for the current through it. Instantaneous AC power in a pure resistive circuit is always positive.

How do you find the instantaneous power of an AC circuit?

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As in DC circuits, the instantaneous electric power in an AC circuit is given by P=VI where V and I are the instantaneous voltage and current. the power becomes: Averaging this power over a complete cycle gives the average power.

What does negative average power mean?

The negative power then just means the rate of losing energy, here to friction, just as positive power is the rate of accruing energy. ADD: I looked again and note the wording of the question says “find the average power PRODUCED” by the sliding.

## Can mechanical power negative?

Yes mechanical energy can be negative. Mechanical energy is the sum of potential as well as kinetic energy.

### Is negative power absorbed or delivered?

The total power delivered to a circuit is equal to the total power absorbed. Given that power delivered is a negative quantity and power absorbed is a positive quantity, the law of conservation of energy implies that the total power of all elements in a circuit is zero.

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What is negative voltage in AC?

We never describe an AC voltage as being negative in sign, because the facility of polar notation allows for vectors pointing in an opposite direction. If one AC voltage directly opposes another AC voltage, we simply say that one is 180o out of phase with the other.

When an AC power is applied to reactive load the power?

So, the real power in the circuit is zero. As the real power is zero, the power factor will be zero. It happens when ϕ = 90° i.e. the voltage is 90 degrees out of phase with the current. Hence, when ac power is applied to a circuit having reactive load, the voltage is 90 degrees out of phase with the current.

## What is meant by instantaneous power?

Instantaneous power is defined as the limiting value of the average power when time tends to zero.

### What happens if the power is negative?

A negative exponent takes us to the inverse of the number. In other words, a-n = 1/an and 5-3 becomes 1/53 = 1/125. This is how negative exponents change the numbers to fractions. Let us take another example to see how negative exponents change to fractions.

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What types of energy can be negative?

It depends on your definition of energy. Potential energy can be negative, and often is. Any attractive force has a negative potential energy. If you take an electron and positron together, the total energy shrinks as you move them closer together, because the coulomb potential becomes more negative.

Can a current source absorb power?

Current Source Summary Also for solving circuit analysis and theorems, current sources become open-circuited sources to make their current equal to zero. Note also that current sources are capable of either delivering or absorbing power.