The ammeter actually has a certain resistance, but the resistance of the ammeter is very small. If the resistance of a double range (0.6A, 3a) ammeter is 002 Ω, what will happen when the ammeter is connected to a dry battery with a voltage of 1.5V?

The ammeter actually has a certain resistance, but the resistance of the ammeter is very small. If the resistance of a double range (0.6A, 3a) ammeter is 002 Ω, what will happen when the ammeter is connected to a dry battery with a voltage of 1.5V?

Battery short-circuit heating. Instant current is very large, will not burn the meter down do not know

Let n be a natural number greater than 0. Can you guess the size between √ (n + 2) - √ (n + 1) and √ (n + 1) - √ (n)

[2√（n＋1）]^2=4n+4
[√（n＋2）+√n]^2=2n+4+2√n（n＋2）>2n+4+2n=4n+4
√（n＋2）+√n>2√（n＋1）
√（n＋1）-√n√（n＋1）－√（n）

Two bulbs are connected in series in the circuit, the power supply voltage is 12V, the voltage at both ends of bulb L1 is 9V, and the resistance of bulb L1 is 30 ohm

(1) 0.3 A (2) 10 EU (3) 40 EU

Solving equation 16x & # 178; - 9 = 40
How to explain the detailed process

16x²-9＝40
16x² = 49
x² =49/16
X = 7 / 4 or x = - 7 / 4

Why do conductors have resistance? What factors are related to the resistance of conductors?

When a conductor conducts electricity, there is a free moving charge inside. When the charge moves, the resistance is generated due to the collision between the conductor atom and the free charge, as well as the interaction between the charges. The influencing factors include the material, that is, the resistivity, the cross-sectional area of the conductor, the length and temperature of the conductor, etc

Two practical problems of solving equations
1. There are two barrels of oil. The mass of barrel a is 1.5 times that of barrel B. If you pour 2.5 kg of oil into barrel B, the mass of the two barrels of oil is exactly the same. How many kg are the two barrels of oil?
2. In a two-tier bookshelf, the books on the upper shelf are three times as many as those on the lower shelf. If 40 books on the upper shelf are moved to the lower shelf, the books on the upper shelf are twice as many as those on the lower shelf. How many books are there on the upper shelf and on the lower shelf?

Let x = 1.5y, x = y + 2.5, take 1.5y = y + 2.5Y = 5, put y = 0.5 into 1, get x = 7.5 A: a barrel has 7.5kg, B barrel has 5kg

How many hours can a 50 watt bulb light up with one degree of electricity
Right? X hours, 0.05x = 1

Yes, 20 hours

Decomposition factor: (a-a-178; - 1) & 178; + 6 (1-a-178;) + 9

(a²-1)²+6(1-a²)+9
=（a²-1）²-6(a²-1)+9
=(a²-1-3)²
=(a²-4)²
=(a+2)²(a-2)²;
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What is the maximum output power of 4.5a battery

The battery is calculated according to the capacity, which has nothing to do with the power! Your battery should be 4.5 A / h (read as 4.5 A / h), that is to say, it can discharge continuously for 1 hour with 4.5 a current
To say that the maximum output current of the battery is still a little close to the edge
The variety of storage battery is divided by use, and the discharge current of storage battery for different use is also different
Our daily common are: start type, traction type, fixed type and so on
The most instantaneous output current is start-up type, its instantaneous current can reach more than 10 times of its own capacity. The short-time discharge current of 4.5a/h battery can reach about 50A

How to calculate easily

1:8 5 + 4:13 7 + (4:8 3-3:13 7)
=1:8 5 + 4:8 3 + (4:13 7-3:13 7)
=6+1=7