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3Electrical Power. Joule’s law. Current supply efficiency.pptx
Direct current Electrical Power. Joule’s law. Current supply efficiency.
Learning objective
To use the formulae of work, power and efficiency of current source in problem solving;
Discussion:
What is power dissipated in a circuit?
Group work
Derive the formula for calculation of total , lost power and power transferred to the load and efficiency in an electric circuit.
Effect of internal resistance on Power from a battery
The power output of the emf is simply
The power dissipated as heat by the internal resistance of the battery is
Likewise, the power transferred to the load is
Note that total power:
Electric Power Efficiency
Power efficiency is defined as the ratio of the output power divided by the input power:
η = Pout / Pin ⋅ 100%
η is the efficiency in percentage (%).
Pin is the input power consumption in watts (W).
Pout is the output power or actual work in watts (W).
(P) Pair work
Intermediate level
Higher level
Extension level
REFLECTION
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