Energy
What is power??
Power is the rate at which work is done.
What is the symbol formula for power??
$$ P = \frac{W}{t} $$
If velocity is the rate of change of displacement, work done is??
The rate of change of energy.
What is the unit of power??
$$ \text{watt}, W $$
What is the equation for power in terms of velocity??
$$ P = Fv $$
How is efficiency calculated??
$$ \frac{\text{useful output energy}}{\text{total input energy}} \times 100% $$
2021-02-03
If $$P = \frac{W}{t}$$ and $$W = VQ$$ How could you write the formula for $P$??
$$ P = \frac{VQ}{t} $$
$$P = \frac{VQ}{t}$$ How could you rewrite this??
$$ P = IV $$
What is electrical power??
The rate of energy transfer per component.
What are the units for power??
$$ W, \text{watts} $$
If $$V = IR$$ and $$P = IV$$ How could you rewrite the power equation??
$$ P = I^2R $$
If $$I = \frac{V}{R}$$ How could you rewrite the power equation??
$$ P = \frac{V^2}{R} $$
Given a power, $P$, how can you calculate the work done $W$ over a given time $t$??
$$ W = Pt $$
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Metadata
date: 2020-11-23 14:50
tags:
- '@?physics'
- '@?public'
- '@?electricity'
- '@?school'
- '@?year-1'
title: Physics - Power