The point where the object rotates is known as the axis of rotation. Mathematically, torque can be written as T = F * r * sin(theta) , and it has units of Newton-meters. When the sum of all torques acting on an object equals zero, it is in rotational equilibrium.
What is the formula for efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C , where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
How do you calculate mechanical power?
power = force × distance (in direction of the force)time taken, so power = force × velocity .
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as I = V/R . The SI unit of current is Ampere (Amp).
What is torque and how is it calculated?
Torque (also called moment — mostly by engineers) is calculated by multiplying force and distance . ... This is a vector with a magnitude of the distance from where the force is applied to the axis of rotation. It points from the axis of rotation toward the point where the force is applied.
What is a good efficiency ratio?
An efficiency ratio of 50% or under is considered optimal. If the efficiency ratio increases, it means a bank’s expenses are increasing or its revenues are decreasing. ... This means the company’s operations became more efficient, increasing its assets by $80 million for the quarter.
What is the formula for calculating energy efficiency?
Energy efficiency is calculated by dividing the energy obtained (useful energy or energy output) by the initial energy (energy input) . For example, a refrigerator has an energy efficiency of 20 to 50%, an incandescent bulb about 5%, a LED lamp over 30%, and a wind turbine 59% at most.
What is the formula for ideal mechanical advantage?
(b) The ideal mechanical advantage equals the length of the effort arm divided by the length of the resistance arm of a lever . In general, the IMA = the resistance force, F r , divided by the effort force, F e . IMA also equals the distance over which the effort is applied, d e , divided by the distance the load travels, d r .
What is Watt formula?
The formula for calculating wattage is: W (joules per second) = V (joules per coulomb) x A (coulombs per second) where W is watts, V is volts, and A is amperes of current. In practical terms, wattage is the power produced or used per second. For example, a 60-watt light bulb uses 60 joules per second.
What does Q mean in physics?
The electric field strength (E) is defined as the amount of force exerted upon a test charge per unit of charge on the test charge (q). That is, E = F / q. ... A charge Q creates an electric field. A test charge q is used to measure the strength of the electric field at a distance d from Q.
What is the formula of electricity?
| Quantity Formulas Unit | Voltage V V = E / Q or V = W / Q E = Energy, W = Work done Volts (V) | Resistance R R = ρl / A ρ = Resistivity, l = length, A = Area or, R = V / I Ohm (Ω) | Power P P = VI Watts (W) | Conductivity σ sigma = 1 / ρ Siemens per meter (S/m) |
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What is a standard hour?
Definition. A standard hour is the amount of work achievable, at the expected level of efficiency, in an hour .
What do efficiency ratios tell us?
Efficiency ratios measure a company’s ability to use its assets and manage its liabilities effectively in the current period or in the short-term. ... These ratios measure how efficiently a company uses its assets to generate revenues and its ability to manage those assets.
How do you increase efficiency ratio?
Your efficiency ratio is your expenses/revenue ratio. The higher the ratio the healthier the business. There are two ways you can improve your ratio: 1) Increase Revenue – the easy way is to achieve this is to serve more customers – There are a number of ways you can Increase Revenue.
How do you calculate average efficiency?
The work efficiency formula is efficiency = output / input , and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it’s energy production or machine efficiency.
What is the formula for efficiency at full load?
Then the efficiency of transformer can be written as : Where, x 2 P cufl = copper loss(P cu ) at any loading x% of full load .
