27. SERIES CIRCUIT PARALLEL CIRCUIT I 1 = I 2 = I 3 I = I 1 +I 2 + I 3 V = V 1 + V 2 + V 3 V = V 1 = V 2 =V 3 R = R 1 + R 2 + R 3 1/R = 1/R 1 + 1/R 2 + 1/R 3
29. SERIES CIRCUIT PARALLEL CIRCUIT The brightness of each bulb is equally the same. Brightness of each bulb is greater If one bulb blow out, the circuit is broken. V = V 1 = V 2 =V 3 R = R 1 + R 2 + R 3 1/R = 1/R 1 + 1/R 2 + 1/R 3
32. Electromotive force, E Potential difference, V Indicates the electrical energy given to 1 C of charge flowing through the cell or source . Indicates the electrical energy that is transformed to other forms of energy when 1 C of charge passes between two point in a circuit. Represented by the voltmeter reading in an open circuit (when switch is opened) Represented by the voltmeter reading in a closed circuit (when switch is closed) Measured in JC -1 or Volts,V Measured in JC -1 or Volts,V Formula E = I (R + r) (R+r) = total external resistance and total internal resistance Formula V = IR R = Total external resistance
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40. These appliances are labeled with values such as 240 V 60 W..What do these labels mean?
42. E /J V/ V Q /C E /J P/W t/s Electrical energy, E Electrical power, P defined as the ability of the electric current to do work. defined as the rate of energy dissipated or transferred Since V = E/Q Q =It V = IR Since P = E/t E = VIt V = IR Then , E = VIt Then, P = VI and E = I 2 Rt and P = I 2 R P = V 2 R
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