Sheria ya Ohm ni nini?

Sheria ya Ohm inasema kwamba mkondo unaopita kwenye kondakta kati ya pointi mbili unasawiana moja kwa moja na voltaji kati ya pointi hizo mbili, na kinyume chake na upinzani. Fomula ni V = I × R, ambapo V ni voltaji kwa volti, I ni mkondo kwa ampea, na R ni upinzani kwa ohm.

Uhusiano kati ya voltaji, mkondo, upinzani na nguvu ni upi?

The four fundamental relationships are: V = I × R (Ohm's Law), P = V × I (power), P = I² × R (power from current and resistance), and P = V² / R (power from voltage and resistance). Knowing any two values allows you to calculate the other two.

Upinzani wa mfululizo na ule wa sambamba hutofautiana vipi?

In series, resistances add directly: R_total = R1 + R2 + R3. In parallel, reciprocals add: 1/R_total = 1/R1 + 1/R2 + 1/R3. Series increases total resistance, while parallel decreases it. For two parallel resistors: R_total = (R1 × R2) / (R1 + R2).

Kondaktansi ya umeme ni nini?

Kondaktansi (G) ni kinyume cha upinzani: G = 1/R. Inapimwa kwa siemens (S). Kondaktansi ya juu inamaanisha nyenzo inaendesha umeme kwa urahisi zaidi. Ni muhimu katika uchambuzi wa mizunguko ya sambamba, ambapo kondaktansi zinajumlishwa moja kwa moja.

Je, Sheria ya Ohm inatumika kwa mizunguko ya AC?

Ohm's Law applies to AC circuits when using impedance (Z) instead of resistance (R). In AC, V = I × Z, where Z includes resistance, inductive reactance (XL = 2πfL), and capacitive reactance (XC = 1/2πfC). For purely resistive AC loads, V = IR still applies directly.

Zana ya Uhandisi Isiyolipisha

Kikokotoo cha Sheria ya Ohm’

Ingiza mojawapo ya mbili kati ya vigezo vya umeme vinavyojulikana — Voltaji, Mkondo, Upinzani, au Nguvu — na kukokotoa mara moja vyote vinne, pamoja na kondaktansi na nishati kwa saa.

V = I × R P = V × I Ohm’s Wheel

Results

Voltage

—

Current

—

Resistance

—

Power

—

Konduktansi (G = 1/R)

—

Nishati kwa Saa

—

Ohm’s Law

Sheria ya Ohm’s inafafanua uhusiano wa msingi kati ya volti, mkondo, na upinzani katika mzunguko wa umeme:

Mahusiano ya Nguvu za Umeme

Nguvu za umeme zinaweza kuhesabiwa kutoka kwa mchanganyiko wowote wa thamani mbili zinazojulikana:

Gurudumu la Sheria ya Ohm’s

All twelve formulas derived from V = IR and P = VI:

Find	From V & I	From V & R	From I & R	From P
V	—	—	V = I × R	V = P / I or √(P × R)
I	—	I = V / R	—	I = P / V au √(P / R)
R	R = V / I	—	—	R = V² / P or P / I²
P	P = V × I	P = V² / R	P = I² × R	—

Mfano wa Vitendo

Mfano — Hesabu ya Kipinga cha LED

Given: Supply = 12 V, LED forward voltage = 2 V, desired current = 20 mA

Volti kwenye kipinga: 12 − 2 = 10 V

R = V / I = 10 / 0.020 = 500 Ω

P = V × I = 10 × 0.020 = 0.2 W (tumia kipinga cha ¼W kwa kiwango cha chini)

Tip: Konduktansi (G) ni kinyume cha upinzani: G = 1/R, inayopimwa kwa siemens (S). Ni muhimu katika uchambuzi wa mzunguko wa sambamba ambapo konduktansi zinaongezwa moja kwa moja: G_total Kikokotoo cha Mtelemko wa Injini