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Power = (current) times (voltage)
Current = (Power) divided by (voltage)
Voltage = (Power) divided by (current)
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Formula used to find the maximum current that can be carried by a resistor if resistance and wattage rating is known?
Manipulate the following equation, to make I the subject: P = I2R, where P = power, I =current, and R = resistance.
Power may be expressed as what times resistance?
Power=current squared times resistance
Why is the formula squared in power dissipation of electrical resistance?
The fundamental equation for the power of any load is the product of the voltage across the load and the current through it: P = U I.Since voltage is the product of current and resistance (U = I R), we can substitute for voltage in the original equation:P = U I = (IR) I = I2R
What are Ohms Law and the Power Law?
Ohms Law is used for the measurement of resistance. You can find the resistance in a series circuit using this equation; amps=volts/resistance or volts=amps x resistance.The Power Law is used to find the wattage in the circuit. You can find the amount of watts using this equation: watts=volts x amps.CommentOhm's Law has nothing whatsoever to do with either resistance or power.The equation, R = E/I, is derived from the definition of the ohm, and not from Ohm's Law.Ohm's Law simply describes a linear relationship between the potential difference across a conductor and the current through it. It does NOT describe the relationship between potential difference, current, and resistance.
What is the power dissipated by a resistor with a current of 0.02 A adn a resistance of 1000 ohms?
Power dissipated = I2R 0.022 x 1000 = 0.4 watts
Formula used to find the maximum current that can be carried by a resistor if resistance and wattage rating is known?
Manipulate the following equation, to make I the subject: P = I2R, where P = power, I =current, and R = resistance.
What is an equation for power?
Power = (energy used)/(time to use it)Power dissipated by an electrical circuit =(voltage across the circuit) x (current through the circuit)or(resistance of the circuit) x (square of the current through the circuit)or(square of the voltage across the circuit)/(resistance of the circuit)
What are the relationships between current power and resistance?
Power is inversely proportional to resistance. Ohm's law: Current is voltage divided by resistance Power law: Power is voltage times current, therefore power is voltage squared divided by resistance.
Does voltage divided by watts equal the current?
Electric power is not defined as current divided by voltage. Electric power (Watts) is equal to amps times voltage
What is the power dissipated by an 8.2k ohm resistor if a current of 0.005 amps is passing through the resistor?
Take your pick:P = V x I (Power = Voltage x Current)or:P = V2 / R (Power = Voltage2 / Resistance)or:P = I2 *R (Power = Current2 x Resistance)(the last two equations come from combining the ohms law equation R=V/I with the power equation P=VxI)In the question above you have resistance and current therefore:P = I2 *R = 0.0052 x 8.2k = 0.0052 x 8200 = 0.205W = 205mW
Why does a cooker have a small resistance?
The cooker uses electrical power to generate heat. It takes a large amount of electrical power to generate a large amount of heat. Since power is current draw times operating voltage, you need a low resistance to draw a large current since you can't increase the operating voltage. Mathematically speaking, Ohm's Law (E=IR) gives the relationship between voltage (E), current (I) and resistance (R). Since power (P=EI) is what is produced and is related to the heat produced, rearranging the elements gives a second equation that relates power to voltage and resistance (P=E2/R). So you can see that for a constant voltage (E), a low R value gives a high power (P) value.
What is resistance power?
All resistances will emit heat energy when a current flows. The heat production rate (or power) can be found by any of these formulas: Power = Current * Voltage Power = Current2 * Resistance Power = Voltage2 / Resistance. Power is given in Watts when Current is in Amps, Voltage in Volts, and Resistance in Ohms.
What is the power if the resistance is 1.2k and the current is 0.024 ma?
If the resistance is 1.2k and the current is 0.024 ma, then the voltage is 0.0288 volts. (Voltage = resistance times current) If the voltage is 0.0288V and the current is 0.024 ma, then the power is 0.6912 microwatts. (Power = voltage times current)
Power may be expressed as what times resistance?
Power=current squared times resistance
How do you find the voltage?
Using Ohm's law, you can find voltage if power is given. The equation needed to solve for power is P(Power)= Voltage(E) x Current(I). Ohm's Law describes the relationship between resistance, current, power, and voltage.
Why is the formula squared in power dissipation of electrical resistance?
The fundamental equation for the power of any load is the product of the voltage across the load and the current through it: P = U I.Since voltage is the product of current and resistance (U = I R), we can substitute for voltage in the original equation:P = U I = (IR) I = I2R
What is the current in a circuit that has a resistance of 30 ohms and a power of 2 watts?
Use the formula: P=IR (power = current x resistance).
