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):

Power

Voltage (V):

 
? Enter voltage in Volts(V)

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

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

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

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

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

Power (P):

Voltage

Power (P):

 
? Enter power in Watts(W)

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

Voltage (V):
Power (P):
 
? Enter power in Watts(W)

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

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

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

Voltage (V):

Current

Voltage (V):

 
? Enter voltage in Volts(V)

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

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

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

Current (I):
Power (P):
 
? Enter power in Watts(W)

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

Current (I):

Resistance

Voltage (V):

 
? Enter voltage in Volts(V)

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

Resistance (R):
Power (P):
 
? Enter power in Watts(W)

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

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

Power (P):
 
? 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):

Cable resistance and conductance

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

 
? Resistance at reference temperature (Tref)

Temp coefficient (α):
 
? Temperature coefficient at Tref

Temperature (T):
 
? Temperature

Temperature reference (Tref):
 
? Temperature reference Tref

Resistance (R):
Conductance: G = 1 / R
Resistance (R):
 
? Resistance (R)

Conductance (G):
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