**Ohmâ€™s law Formulas**

When current and power are given use V = P/I to find the volts. Example #2: Find the voltage applied across an unknown resistor which dissipates 20 watts power while 5 A current is flowing through it.... For instance, if you know the power and the voltage in a given circuit, you can calculate the current by dividing the power by the voltage. Power and Resistance. We can combine the equations for power and Ohm’s Law to get expressions for power in terms of resistance: Heat. As current flows through a resistor, the resistor heats up. The heat in joules is given by: where t is the time in

**Calculating resistance given capacitance and charge over time**

The thermal resistance junction-ambient R(thJA) (Often written as ?JA), tells us how hot the junction gets when (1) the regulator is dissipating a given amount of power and (2) the regulator is sitting in open air, at a given ambient temperature. Suppose that we need to design our regulator to only work under modest commercial conditions, that will not exceed 60 °C. If we need to keep the... The equivalent resistance of the circuit is (since the load resistance is in series with the internal resistance), so the current flowing in the circuit is given by (145) The power output of the emf is simply

**Power voltage current? Physics Forums**

Energy and Power Energy Energy is the capacity to change a physical situation. It is clear that we cannot find the resistance (R) of the heater from this formula because there is no R. But we can find R by using an Ohms law formula • If a 960 watt heater draws 4 amperes from a 240 volt supply calculate its resistance. We know that E = 240 volts and I = 4 amps and we want to find R. We how to get another teachers room Raise the current to the power of 2 and then multiply by the resistance to calculate the electrical power. For example, if the current is 1.5 amperes and the resistance is 250 ohms, then the power is 562.5 watts (1.5 amperes x 1.5 amperes x 250 ohms).

**To find the resistance of given wire using metre bridge**

Maximize Power Delivered to Circuits Optimization Problem . The first derivative is used to maximize (optimize) the power delivered to a load in electronic circuits. Problem 1: In the electronic circuit shown below, the voltage E (in Volts) and resistance r (in Ohms) are constant. R is the resistance of a load. In such a circuit, the electric current i is given by i = E / (r + R) and the power how to find refractive index of air The thermal resistance junction-ambient R(thJA) (Often written as ?JA), tells us how hot the junction gets when (1) the regulator is dissipating a given amount of power and (2) the regulator is sitting in open air, at a given ambient temperature. Suppose that we need to design our regulator to only work under modest commercial conditions, that will not exceed 60 °C. If we need to keep the

## How long can it take?

### How to find the efficiency of a motor when resistance

- Energy and Power UFBA
- Ohmâ€™s law Formulas
- Ohmâ€™s law Formulas
- How to find the efficiency of a motor when resistance

## How To Find Resistance When Given Power

Maximize Power Delivered to Circuits Optimization Problem . The first derivative is used to maximize (optimize) the power delivered to a load in electronic circuits. Problem 1: In the electronic circuit shown below, the voltage E (in Volts) and resistance r (in Ohms) are constant. R is the resistance of a load. In such a circuit, the electric current i is given by i = E / (r + R) and the power

- When current and power are given use V = P/I to find the volts. Example #2: Find the voltage applied across an unknown resistor which dissipates 20 watts power while 5 A current is flowing through it.
- If it isn't given on the name plate : Efficiency = Pm/Pe Pm ( Mechanical power written on the name plate ) In 3 phase motor Pe ( Electrical Power )( Pe =root 3 *Vl*Il*P.F ) Where Vl & Il …
- 17/01/2012 · I have been trying to understand how to calculate real power and power factor in an AC circuit when given only circuit voltage and real/true current as measured by a current transformer (CT). What I (think I) know: 1. Real power P = I^2 * R (but I don't know the circuit resistance) 2. Real power
- Maximize Power Delivered to Circuits Optimization Problem . The first derivative is used to maximize (optimize) the power delivered to a load in electronic circuits. Problem 1: In the electronic circuit shown below, the voltage E (in Volts) and resistance r (in Ohms) are constant. R is the resistance of a load. In such a circuit, the electric current i is given by i = E / (r + R) and the power