For the resistance coil with uniform thickness, the cross load area of the resistance wire is 2mm2 square, and the resistance rate is 1.1 times 10 to the negative sixth power ohm M A voltage of 4.4V is applied to both ends of the coil, and the current passing through it is measured to be 0.8A

For the resistance coil with uniform thickness, the cross load area of the resistance wire is 2mm2 square, and the resistance rate is 1.1 times 10 to the negative sixth power ohm M A voltage of 4.4V is applied to both ends of the coil, and the current passing through it is measured to be 0.8A

The resistance is easy to calculate, which is equal to 4.4v/0.8a = 5.5 Ω,
Then ρ L = R S / L is the length of the wire,
l=5.5 * 2/1.1 = 10m
According to Ohm's law, r = u / I, the resistance value is 5.5 Ω
Then use the resistance formula r = ρ L / s to find the length L
The voltage of household electricity is 220 V, 50 Hz. How big is its current? Is there a fixed value?
Good question! The current has no fixed value. You can think about the "fuse" in every home (now many places use the safety switch, that is, the one that can trip itself). If the current is fixed, what is the use of the fuse? Its use is to fuse itself when the current is too large, so as to protect
The density of copper is 8.9 × 103kg / m3. When a solid copper block is completely immersed in a beaker full of water and the volume of overflow water is 10cm3, then ()
A. The volume of water in the beaker is 89cm3b. The mass of copper is 89gc. The mass of copper is 10gd
∵ the solid copper block is completely immersed in water, ∵ V copper = V overflow = 10cm3, the mass of copper block: M = ρ V copper = 8.9g/cm3 × 10cm3 = 89g, so B is correct and CD is incorrect; the volume of water in beaker is uncertain, so a is incorrect. So B is selected
The product of 0 power of 1 minus 1 / 2 power of 2009 multiplied by - 2 power of 2010
It's better to have a written explanation.
1^0-(1/2)^2009*(-2)^2010
=1-2^(-2009)*2^2010
=1-2^(-2009+2010)
=1-2
=-1
=1-2=-1
1*0-1/2*2009X（-2）*2010
=1-【（2*-1）*2009】X（-1）X2*2010
=1+2*-2009X2*2010
=1+2
=Can you explain mathematics and physics? thank you! Multiply with the base power, the base number remains unchanged, the negative index power of the exponential addition fraction is equal to the positive index power of its reciprocal, these two I also think wrong, the even power of the negative number is equal to the even power of its opposite number, it should be upstairs. Sorry, I've done it for a long time, a little forgotten... Open it up
1*0-1/2*2009X（-2）*2010
=1-【（2*-1）*2009】X（-1）X2*2010
=1+2*-2009X2*2010
=1+2
=Can you explain mathematics and physics? thank you!
How to calculate the power consumption per hour when the current of 220 V power supply is known
The power consumption per hour can not be calculated when the current of 220 V power supply is known, because the power factor is not known. The power consumption usually refers to the active power. Only when the active current is known can the power consumption be calculated. 1000 watt hour is 1 kilowatt hour. 220 * active current / 1000 = power consumption per hour
The density of copper is 8.9 × 10 cubic kilogram / cubic meter?
The density of copper is 8.9 × 10 cubic kilogram / cubic meter
The mass of copper per unit volume (cubic meter) is 8.9 * 10 ^ 3kg
A cubic meter of copper weighs 8.9 * 10 ^ 3kg.
The mass of copper per cubic meter is 8.9 × 10 cubic kilogram
Cubic kilogram of 8.9 * 10 per cubic meter
It's so heavy
A solid copper block with a length of 1 meter, a width of 1 meter and a height of 1 meter weighs 8.9 * 10 cubic kilogram
It is known that a = (2 + radical 5) to the power of 2010 (radical 5-2) to the power of 2010-2 (radical 5 + radical 2) to the power of 0 + radical-2 to the power of 3
a=(2+√5）^2010*(√5-2）^2010-2(√5+√2）^0+（√-2）^3
=(5-4）^2010-2+2√2i
=1-2+2√2i
=-1+2√2i.
If (√ 2) ^ 3, then a = 2 √ 2-1
A = (2 + root 5) to the power of 2010 (root 5-2) to the power of 2010-2 (root 5 + root 2) to the power of 0 + root-2 to the power of 3
=[(2 + radical 5) (radical 5-2)] ^ 2010-2 * 1 +? - 8
=1-2-8+?
=-9+?
What's your + root number???
I hope my answer will help you. Good luck! Like this question oneself tries under, next time will be able to!
I wish you academic progress! (*^__ ^*)... Unfold
A = (2 + root 5) to the power of 2010 (root 5-2) to the power of 2010-2 (root 5 + root 2) to the power of 0 + root-2 to the power of 3
=[(2 + radical 5) (radical 5-2)] ^ 2010-2 * 1 +? - 8
=1-2-8+?
=-9+?
What's your + root number???
I hope my answer will help you. Good luck! Like this question oneself tries under, next time will be able to!
I wish you academic progress! (*^__ ^*) put it away
An electric appliance with a power of 30 watts works for 12 hours and consumes () degrees of electricity
The electricity consumption of an electrical appliance with a power of 30 watts for 12 hours is (0.36) degree
The density of copper is 8.9 times 10 to the power of 3 kg1 cubic meter. What is the physical meaning? What is the density of the remaining half of a piece of copper sawed off
The mass of copper with a volume of 1m3 is 8900kg. Half of the copper is sawed off, and the density of the remaining half remains unchanged. The volume is halved, and the mass is halved, and the density remains unchanged, which is still 8.9x10 ^ 3kg/m3
After a section of copper wire is folded in half and twisted into a strand, its resistance becomes smaller because of its high resistance______ Shorter, and______ As a result, the resistance of a metal wire will decrease after it is evenly stretched______ That's because of the wire______ Get bigger, at the same time______ It's getting smaller
(1) After a copper wire is folded in half and twisted into a strand, its length becomes shorter and its cross-sectional area becomes larger, so its resistance becomes smaller; (2) after a metal wire is evenly stretched, its length becomes larger and its cross-sectional area becomes smaller, so its resistance will become larger; so the answer is: length, cross-sectional area, larger, length, cross-sectional area