Formula list for D.c Circuits
Ohm's Law
| Voltage (V): |
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Enter voltage in Volts(V)
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|---|---|---|
| Resistance (R): |
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Enter resistance in Ohms(Ω)
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| Current (I): |
|---|
| Current (I): |
?
Enter current in Amperes(A)
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|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Voltage (V): |
|---|
| Voltage (V): |
?
Enter voltage in Volts(V)
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|
|---|---|---|
| Current (I): |
?
Enter current in Ampere(A)
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| Resistance (R): |
|---|
Cable Resistance
R = (ρl)/A
| Resistivity (ρ): |
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Enter resistivity in ohm-meters
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|---|---|---|
| Length (l): |
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Enter length in meters
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| Cross-sectional area (A): |
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Enter cross-sectional area in square meters
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| Resistance (R): |
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Cable Resistance
R = Rref (1 + α (T - Tref))
| Resistance (Rref): |
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Resistance at reference temperature (Tref)
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|---|---|---|
| Temp coefficient (α): |
?
Temperature coefficient at Tref
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| Resistance (R): |
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Power
| Voltage (V): |
?
Enter voltage in Volts(V)
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|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
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| Current (I): |
|---|
| Current (I): |
?
Enter current in Amperes(A)
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|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Voltage (V): |
|---|
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Current (I): |
?
Enter current in Ampere(A)
|
| Resistance (R): |
|---|
Voltage
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Current (I): |
|---|
| Current (I): |
?
Enter current in Amperes(A)
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|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Voltage (V): |
|---|
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Current (I): |
?
Enter current in Ampere(A)
|
| Resistance (R): |
|---|
Current
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Current (I): |
|---|
| Current (I): |
?
Enter current in Amperes(A)
|
|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Voltage (V): |
|---|
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Current (I): |
?
Enter current in Ampere(A)
|
| Resistance (R): |
|---|
Resistance
| Voltage (V): |
?
Enter voltage in Volts(V)
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|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Current (I): |
|---|
| Current (I): |
?
Enter current in Amperes(A)
|
|
|---|---|---|
| Resistance (R): |
?
Enter resistance in Ohms(Ω)
|
| Voltage (V): |
|---|
| Voltage (V): |
?
Enter voltage in Volts(V)
|
|
|---|---|---|
| Current (I): |
?
Enter current in Ampere(A)
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| Resistance (R): |
|---|
Efficiency
η = (power out)/(power in) ×100%
| Power out: |
?
Enter power out
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|---|---|---|
| Power in: |
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Enter power in
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| Efficiency (η): |
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