How do you calculate the resistance in a coil?

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Calculating the resistance in a coil typically requires knowing the material's resistivity, which can be derived from the coil's dimensions and material type. While voltage and coil diameter are useful, they alone do not provide enough information to determine resistance without the amperage value. An ammeter can measure current directly, but alternative methods involve using the formula R = V/I, where R is resistance, V is voltage, and I is current. Additionally, the resistance can be estimated using the coil's length, cross-sectional area, and resistivity of the material. Understanding these principles is essential for accurate calculations in electrical applications.
Sirsh
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Hi all. I'm just wondering if it is possible to calculate the resistance in a coil without the amperage value? I've got voltage,coil-diametre, amount of turns, coils material type.

The only way i think it is possible if i set a ampmetre into the circuit. is there any way?

Thank you.
 
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Sirsh said:
Hi all. I'm just wondering if it is possible to calculate the resistance in a coil without the amperage value? I've got voltage,coil-diametre, amount of turns, coils material type.

The only way i think it is possible if i set a ampmetre into the circuit. is there any way?

Thank you.

Google "resistivity"
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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