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Power is equivalent to voltage times current (DC system). So, without current, power is zero.
You could look at it from a physical perspective: your wall socket always has voltage on it, but unless you provide a path (plug something in), there will be no current, therefore no power usage. For that matter, there is natural voltage gradients between the earth and clouds, the earth and high voltage power lines, etc. This means there is a buildup of electrons / depletion of electrons at one location relative to another. Power is not transferred until a path is provided to allow those electrons to move from one location to another. Once a path is created, the electrons will try to flow from one point to another to reach equalibrium. This flow of electrons from one location to another is known as current. The buildup of electrons at one location relative to another is known as voltage.
What else can I help you with?
Can you calculate power by multiplying voltage and current?
Not enough information. Power = current x voltage. Since voltage can be anything, there is no way to calculate power. Time is irrelevant; though once you have the power, it can help you calculate energy (energy = power x time).
How do you know when electric current is flowing in a light bulb circuit?
You know if current is flowing in a bulb circuit because, if there is enough power (voltage times current), the bulb will illuminate. If there is current, but not enough power to illuminate the bulb, you will need to measure the current with an ammeter to see if there is any current.
What formula would you use to calculate the current drawn in a low beam headlamp circuit?
Since power is the product of voltage and current, you will need to find out the power rating of the headlamp when on low beam. To find the current, divide the power of the lamp by the voltage (12 V).
How do you figure out an appliance's power consumption if you have the voltage and Frequency and Current?
You just need the voltage and the current. Watts = Amps x Volts.
What equation relates power to current and resistance?
Power = (current) times (voltage)Current = (Power) divided by (voltage)Voltage = (Power) divided by (current)
How do i fine an expression for power that involves only current and voltage?
You do not need ohm's law to relate power to current and voltage. Power is current times voltage. If you know current and voltage, you do not need to know resistance.
Is current reduces with increase in powerfactor?
If power factor is increased, current will be reduced for a specific real power (kWs) relative to before. Total power is real power plus the vector of reactive power (you have to do polar math). So total current = (current from real power) + (current from reactive power). By changing the power factor, you decrease the second quantity. Go to Wikipedia.com and search for Power Factor if you need a more extensive description.
How much power used on 600v?
To calculate power used on a 600V circuit, you need to know the current flowing through it in amperes. Then, multiply the voltage by the current to find the power in watts using the formula: Power (W) = Voltage (V) x Current (A). Without the current value, we cannot determine the power consumption.
What is important when measuring power?
To measure power, you need the Voltage, and Current. In the case of AC you need the number of phases, and the power factor. Once you have these, you can find the proper formula.
Does The higher the amperage equal more electrical power?
Not necessarily. Amperage (current) is just one component of electrical power. Power is the product of voltage and current. To calculate power, you need both voltage and amperage.
How many volts to make one watt?
Wattage refers to power power is voltage times current. P = V*I Therefore, in order to know the voltage you need you also need to measure the current (units of amps).
Can you calculate power by multiplying voltage and current?
Not enough information. Power = current x voltage. Since voltage can be anything, there is no way to calculate power. Time is irrelevant; though once you have the power, it can help you calculate energy (energy = power x time).
How do you know when electric current is flowing in a light bulb circuit?
You know if current is flowing in a bulb circuit because, if there is enough power (voltage times current), the bulb will illuminate. If there is current, but not enough power to illuminate the bulb, you will need to measure the current with an ammeter to see if there is any current.
How to Calculate three phase watts with unbalanced phase current?
You will need to determine the power per phase, and add them up to give the total power of the three-phase load. To do this, you will need to multiply the phase-voltage by the phase current by the power factor -for each phase.
What formula would you use to calculate the current drawn in a low beam headlamp circuit?
Since power is the product of voltage and current, you will need to find out the power rating of the headlamp when on low beam. To find the current, divide the power of the lamp by the voltage (12 V).
How do you figure out an appliance's power consumption if you have the voltage and Frequency and Current?
You just need the voltage and the current. Watts = Amps x Volts.
How long has the current government been in power?
for thousands of years
