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Voltage is the difference in charge between two points. Current is the rate at which charge is flowing. Resistance is a material's tendency to resist the flow of charge (current). So, when we talk about these values, we're really describing the movement of charge, and thus, the behavior of electrons.
Power & Energy. Ø Power is measured in W (Watt) and it is the rate at which energy is generated or consumed at a given time. Ø Energy is measured over time in Wh (Watt-hour). That’s what the electricity company usually bills for. Ø When a 1 W appliance is used for one hour, the energy used is 1 Wh.
The peak value of a sine wave is the value of voltage (or current) at the positive or the negative maximum (peaks) with respect to zero. Since positive and negative peak values are equal in magnitude, a sine wave is characterized by a single peak value.
For the W to V conversion, we can use the formula for electric power: P (W) = I (A) * V (V) To calculate volts from watts, we need to rearrange this formula by expressing voltage like this: Volt = Watts / Amps. To convert watts to volts, we need to know how many amps does the electrical circuit has.
Compute peak, RMS, and average values of voltage and current. Define root-mean-squared amplitude, angular velocity, and phase angle. Convert between time domain and phasor notation. Convert between polar and rectangular form. Add, subtract, multiply, and divide phasors.
By knowing any two values of the Voltage, Current or Resistance quantities we can use Ohms Law to find the third missing value. Thus, this Ohm’s Law formula can be used to calculate the values of circuit components, current levels, voltage supplies, and voltage drops around a circuit.
Express electrical power in terms of the voltage and the current. Describe the power dissipated by a resistor in an electric circuit. Calculate the energy efficiency and cost effectiveness of appliances and equipment. In an electric circuit, electrical energy is continuously converted into other forms of energy.
