Formula list for D.c Circuits

Ohm's Law

Voltage (V):

 
? Enter voltage in Volts(V)

Resistance (R):
 
? Enter resistance in Ohms()

Current (I):
Current (I):
 
? Enter current in Amperes(A)

Resistance (R):
 
? Enter resistance in Ohms()

Voltage (V):
Voltage (V):
 
? Enter voltage in Volts(V)

Current (I):
 
? Enter current in Ampere(A)

Resistance (R):

Cable Resistance

R = (ρl)/A
Resistivity (ρ):

 
? Enter resistivity in ohm-meters

Length (l):
 
? Enter length in meters

Cross-sectional area (A):
 
? Enter cross-sectional area in square meters

Resistance (R):

Cable Resistance

R = Rref (1 + α (T - Tref))
Resistance (Rref):

 
? Resistance at reference temperature (Tref)

Temp coefficient (α):
 
? Temperature coefficient at Tref

Resistance (R):

Power

Voltage (V):

 
? Enter voltage in Volts(V)

Resistance (R):
 
? Enter resistance in Ohms()

Current (I):
Current (I):
 
? Enter current in Amperes(A)

Resistance (R):
 
? Enter resistance in Ohms()

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()

Current (I):
Current (I):
 
? Enter current in Amperes(A)

Resistance (R):
 
? Enter resistance in Ohms()

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()

Current (I):
Current (I):
 
? Enter current in Amperes(A)

Resistance (R):
 
? Enter resistance in Ohms()

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)

Resistance (R):
 
? Enter resistance in Ohms()

Current (I):
Current (I):
 
? Enter current in Amperes(A)

Resistance (R):
 
? Enter resistance in Ohms()

Voltage (V):
Voltage (V):
 
? Enter voltage in Volts(V)

Current (I):
 
? Enter current in Ampere(A)

Resistance (R):

Efficiency

η = (power out)/(power in) ×100%
Power out:

 
? Enter power out

Power in:
 
? Enter power in

Efficiency (η):
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