Physical Meaning and Definition of Electrical Power!

Electrical power is a physical quantity that indicates how fast or slow an electric current does work.

High electrical power means that the current does work quickly;

The electrical work done per unit of time is called electrical power. The electrical work done per unit of time is called electrical power.

Unit Relationships: What are the constraints.

It can only be true"Pure resistance"Circuit use.

1 watt = 1 volt·ampere.

Definition: The electrical energy consumed by an electrical item per unit of time is the electrical power of the item.

Physical significance: refers to the energy consumption of an electrical appliance.

Definition: The work done by an electric current per unit of time is called electrical power Physical Meaning:

Electrical power is a physical quantity that indicates how fast or slow an electric current does work.

What is the physical meaning of electrical power.

1. Electric work. 1) Definition: The work done by the electric field force on a moving charge in a circuit is referred to as electrical work, which is also usually said to be the work of an electric current.

2) Substance: the transformation of energy and the embodiment of the law of conservation in the circuit.

Electrical energy is converted into other forms of energy by the work done by an electric current.

In the previous chapter, I learned about the work of the electric field force on the charge, if the charge.

Under the action of the electric field force, the potential difference between the two points of AB is .

then the electric field force does the work.

For a conductor, the potential difference between the two ends is.

Put the charge. Moving from one end to the other, the work of the electric field force.

An electric current is formed in the conductor, and.

at intervals.

The amount of electricity carried within is.

Then the current through the conductor section is, so.

This is the expression that the work done by the electric field force in the circuit is the electrical work.

3) Expressions:

Explanation: The physical meaning of the expression: The work of the current on a circuit is proportional to the voltage at both ends of the circuit, the current intensity in the circuit, and the energizing time.

Applicable conditions: No change with time – constant current.

4) Unit: The unit of current is ampere (a), the unit of voltage is volt (v), and the unit of time is second (s), then the unit of electric work is joules (j).

5) Electrical power.

Expression: Physical Meaning: The power on a circuit is proportional to the voltage at both ends of the circuit and the current intensity in the circuit.

1. The power on a section of the circuit is proportional to the voltage at both ends of the circuit and the current intensity in the circuit.

2. As a physical quantity that indicates how fast or slow the work of the current is done, the power of an electrical appliance is numerically equal to the electrical energy it consumes in 1 second.

Definition of electrical power:

1. Electric power is the work done by the electric field driving current in the circuit per unit time.

2. It is a physical quantity used to express the speed of electrical energy consumption in the field, which is represented by p, and its unit is watts, referred to as watts, and the symbol is w.

Electrical power is a physical quantity that indicates how much electrical energy is consumed by a device. Numerically equal to the product of voltage and current! i.e. PUL.

Electrical power is a physical quantity that indicates how quickly an electrical appliance consumes electrical energy. In physics, it is defined as how much of the energy of the electric acorns is consumed per unit of time.

By definition: p=w t. And because w=iut, p= u. Liang Bianbu.

The physical meaning of electrical power is as follows:

Electrical power is a physical quantity that indicates how fast or slow an electric current does work. The work done by an electric current per unit of time is called electrical power. It is a physical quantity used to express the speed of electrical energy consumption, expressed by p, its unit is watts, referred to as "watts", and the symbol is w.

Electrical power is a physical quantity that indicates how fast or slow the work of an electric current is, and the magnitude of the power of an electrical appliance is numerically equal to the amount of electrical energy it consumes in 1 second.

If the amount of electrical energy "W" (Si unit J) is consumed over such a long period of time as "t" (Si unit S), then the electrical power of this appliance is p=w t (defined) The electrical power is equal to the product of the voltage at both ends of the conductor and the current passing through the conductor.

Each electrical appliance has a normal working voltage value called rated voltage, the power of the electrical appliance working normally under the rated voltage is called the rated power, and the power of the electrical appliance working under the actual voltage is called the actual power.

Electrical power of small household appliances:

Electric kettle: rated power 1800W, working current 8A, hourly power consumption. The maximum capacity of boiling water is 4 to 6 minutes, and the estimated power consumption is in the degree.

Rice cooker: rated power 800 1200W (adjustable), working current, hourly power consumption.

Electric pressure cooker: rated power 800W 1300W (adjustable), working current, hourly power consumption.

Induction cooker: rated power 800 2200W (adjustable), working current, hourly power consumption.

Micro-dispatch and parallel wave oven: rated power (input power) 1100 1300W (adjustable), working current 5 6A, hourly power consumption.

Dishwasher: rated power (drying) 700 1200W, working current, hourly power consumption. Non-drying dishwasher, rated power not exceeding 100W, working current not exceeding.

Electric wide oven: rated power 1000 3000W (adjustable), working current dust trace, power consumption 1 3 degrees per hour.

: It depends on the source of the electric power.

In physics, the work done by an electric current per unit of time is called electrical power. It is a physical quantity used to express the speed of electrical energy consumption, which is represented by p, and its unit is watt, abbreviated for short"tile", the symbol is w.

Extension: As a physical quantity that indicates how fast or slow the work of an electric current is done, the magnitude of the power of an electrical appliance is numerically equal to the amount of electrical energy it consumes in 1 second. If in"t"(Si unit is S) the electrical energy "W" (Si unit is J) consumed for such a long period of time, then the electrical power of this electrical appliance is p=w t (defined) electrical power is equal to the product of the voltage at both ends of the conductor and the current passing through the conductor.

p=u·i）。For purely resistive circuits, the electrical power can also be calculated using the formulas p=i 2*r and p=u 2 r.

Each electrical appliance has a normal working voltage value called rated electric touch training voltage, the power of the electrical appliance working normally under the rated voltage is called the rated power, and the power of the electrical appliance working under the actual voltage is called the actual power.

Electricity and safe use of electricity.

The relationship between electrical power and current: In a home circuit, the voltage U=220V is constant. Since i = p u, the greater the total power p of the appliance, the greater the total current i in the circuit.

If the total current in the circuit exceeds the safe value, the fuse is prone to burnout. Therefore, do not use multiple high-power appliances at the same time in the home circuit.

1. Power refers to the amount of work done by an object in a unit of time, that is, power is a physical quantity that describes how fast or slow work is done. The amount of work is certain, and the shorter the time, the greater the power value. The formula for finding power is power = work time.

2. The power characterizes the physical quantity of the speed of the work. The sum of the work done per unit of time is called power and is denoted by p. Therefore, the power is equal to the scalar product of the force and the velocity of the point where the object is stressed.