In a simple circuit, the supply voltage is u, there is a resistor R1 in the circuit, and the current passing through the ammeter is I1. If the current passing through becomes 3i1, then What is the resistance R2 in parallel with R1?

In a simple circuit, the supply voltage is u, there is a resistor R1 in the circuit, and the current passing through the ammeter is I1. If the current passing through becomes 3i1, then What is the resistance R2 in parallel with R1?

The shunt formula is very useful. If you merge the last R2, the voltage at both ends of R1 is still u, the current through R1 is still I1, and the total current is 3i1, then the current flowing through R2 is not 3i1-i1 = 2i1. Using the shunt formula 2i1 = (R1 / (R1 + R2)) × 3i1, the simplified R2 = R1 / 2

As shown in the figure, given the resistance R1 = 5 Ω, the indication of ammeter A1 is I1 = 1a, and the indication of ammeter A is I = 1.5A, calculate: (1) voltage U1 at both ends of R1; (2) current I2 through R2; (3) resistance of R2

(1) The voltage at both ends of R1 is u = i1r1 = 1a × 5 Ω = 5V; answer: the voltage at both ends of R1 is 5V. (2) the current through R2 is I2 = i-i1 = 1.5a-1a = 0.5A; answer: the current through R2 is 0.5A. (3) the resistance of R2 is R2 = ui2 = 5v0.5a = 10 Ω, answer: the resistance of R2 is 10 Ω

How many microamperes is one ampere
Is 1 ampere equals how many μ a, the fastest to be adopted

1000, the rate is 1000