What is the effect of conductor on current called resistance

What is the effect of conductor on current called resistance

The resistance of a conductor to current is called resistance
What resistance should be connected in series for the bulb marked "110V 22W" connected to the circuit with voltage of 220V to make it shine normally
It is better to connect another bulb marked "110V 22W" in series
It's the same resistance as this bulb
P=U^/R
R = u ^ / P = 110 * 110 / 22 Ω = 550 Ω
The resistance is the same as that of the light bulb, r = 110 ^ 2 / 22 = 550~~~~~
When a certain electrical appliance is connected to a 220 V power supply and works normally, its resistance is 484 Ω. How much is the current passing through the electrical appliance? 2. The actual resistance of the electrical appliance
When an electrical appliance is connected to a 220 V power supply and works normally, its resistance is 484 Ω
1. What is the current through the appliance?
2. What is the actual power of the appliance?
3. How many joules does the current work in 5 minutes?
The last two are the process. Thank you
Why is the actual power equal to 100W...... =?
I = u / r = 220V / 484 Ω = about 0.45a
Actual power: P = UI = 220V * 0.45a = 100W
W=Pt=100w*5*60s=30000J
1、I＝U/R＝0.4545A
2、P＝U×I＝220×0.4545＝100W
(or P = u ^ 2 * / R or P = I ^ 2 × R)
3、P*t=100W×300s＝30000J
Let you not study physics!
Why is the larger the cross-sectional area of the resistance, the smaller the blocking effect
ER.. don't be too complicated. I'm only a sophomore in junior high school. I can't understand it very well. Just use easy to understand language. Thank you~
R=ρL/S
ρ - resistivity of material made into resistance, in Ω· m (International System of units); L - length of wire wound into resistance, in M (International System of units); s - cross sectional area of wire wound into resistance, in M2 (International System of units); R - resistance value, in Ω (International System of units)
Because the resistance is inversely proportional to the cross-sectional area, the larger the cross-sectional area, the smaller the resistance
The resistance becomes thicker, just like the original resistance is connected in parallel with one resistance, and the equivalent resistance is smaller than both
The thicker the wire is, the wider the road is. In that case, there are more cars on the road at the same time. The current is the directional movement of electric charges in the wire. The thicker the wire is, the more electric charges pass through the wire at the same time, that is, the greater the current is. In other words, the less the conductor hinders the current at this time. Welcome to communicate again
The experimental results show that for a conductor with uniform cross-section made of a certain material, its resistance R is directly proportional to the length L and inversely proportional to the cross-sectional area s
R=ρL/S
In the metal conductor, the free electrons make directional motion to form electric current under the promotion of electric field. In this process, the electric field force does work on the free electrons, which increases the kinetic energy of the directional motion of the electrons. At the same time, the free electrons constantly collide with the atoms in the crystal lattice, and transfer the directional motion energy to the atoms in the magnetic collision. So from the classical theory of metals, resistance reflects the collision between free electrons and atoms in crystal lattice
The experimental results show that for a conductor with uniform cross-section made of a certain material, its resistance R is directly proportional to the length L and inversely proportional to the cross-sectional area s
R=ρL/S
In the metal conductor, the free electrons make directional motion to form electric current under the promotion of electric field. In this process, the electric field force does work on the free electrons, which increases the kinetic energy of the directional motion of the electrons. At the same time, the free electrons constantly collide with the atoms in the crystal lattice, and transfer the directional motion energy to the atoms in the magnetic collision. Therefore, from the classical theory of metals, resistance reflects the destruction of the directional movement of electrons caused by the collision between free electrons and atoms in crystal lattice. With the same number of free electrons in the directional motion, it is obvious that the larger the cross-sectional area, the weaker the collision, so the smaller the resistance. Put it away
The cross-sectional area of the resistance is like the width of the road. The larger the cross-sectional area is, the wider the road is, the less likely it is to be in traffic jam, and the smaller the obstruction effect is.
The bulb of pz220-100 is connected to the circuit of 220 V and 110 V respectively to calculate the working resistance of the bulb and the actual power under the corresponding voltage
220-100 bulb, refers to the rated voltage U = 220 V, rated power P = 100 W
Working resistance? Generally, the resistance is constant, r = u ^ 2 / P = 484
When u = 220 V, P reaches the rated power, at this time p = 100 W
When u = 110V, the resistance does not change, P = u ^ 2 / r = 25W
What's the result of inserting 220 V electrical appliances into 110 V power supply and 110 V electrical appliances into 220 V power supply?
Please use easy to understand words to describe what the above two situations will produce? What is the basic principle!
The 220 V electric appliance is plugged into the 110 V power supply: the indicator light of the electric appliance power supply may not be on, and the electric appliance does not work. Reason: the actual voltage does not reach the voltage required for normal work, and the electric appliance cannot start normally, so it cannot work
The 110V electric appliance is plugged into the 220V power supply: the electric appliance may burn down, smoke may be emitted, and then it will not work! Reason: the actual voltage exceeds the normal working voltage of the electric appliance, resulting in the damage of the components of the electric appliance, so it can not work
A student uses the circuit as shown in the figure to explore the relationship between the size of conductor resistance and its cross-sectional area. In the figure, a, B and C are nickel chromium alloy wires with the same length and thickness______ To judge the resistance between M and N, the selected resistance wire is______ .
(1) The size of the resistance is converted into the number of ammeter. The larger the current number is, the smaller the resistance is. (2) to explore the relationship between the size of conductor resistance and its cross-sectional area, we should choose conductors A and B with the same material, the same length and different cross-sectional area. Therefore, the answer is: (1) current number; (2) a and B
How many volts is it after connecting a 60 ohm resistor in the 220 V home circuit? (voltage on both sides of the resistor) why?
Every socket of home circuit is 220 V, because every socket is parallel, and the output of parallel circuit is 220 v
So even a 60 ohm resistor is also 220 V, unless it is changed to series, the voltage will change
If the resistance of an electrical appliance is 10 ohm and connected to a 220 V power supply, and it works normally for 2a, the electrical appliance will work normally for 1 minute and consume electric energy
The electric power of the appliance is w
Power consumption: w = uit = 220 × 2 × 60 = 26400 (J)
Electric power of electric appliance: P = UI = 220 × 2 = 440 (W)
A: slightly
We can use w = uit directly, because we can know from the condition that the consumer is a non pure resistance appliance, so we can only use this formula. How to calculate the electric power of the resistor
Under the same condition, the relationship between resistance and wire length and thickness
The longer the wire, the greater the resistance
The thinner the wire, the greater the resistance