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Basic Concepts

Basic Concepts. Discussion D1.2 Chapter 1. Basic Concepts. System of Units Charge Current and Voltage Power and Energy Ideal Circuit Elements. International System of Units (SI). Quantity Basic Unit Symbol Length meter m

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Basic Concepts

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  1. Basic Concepts Discussion D1.2 Chapter 1

  2. Basic Concepts • System of Units • Charge • Current and Voltage • Power and Energy • Ideal Circuit Elements

  3. International System of Units (SI) Quantity Basic UnitSymbol Length meter m Mass kilogram kg Time second s Electric current ampere A Thermodynamic temperature kelvin K Luminous intensity candels cd

  4. SI Prefixes

  5. Examples Express 1 ms/1000 in SI units. Not too long ago, computer disk space was measured in Mbytes. Modern disks have about 10,000 times more storage capacity. In SI units, what is the capacity unit of modern disks?

  6. Charge, q Recall Coulomb’s Law Force F1 on charge q2 due to charge q1 is given by Charge on an electron (proton) is negative (positive) and equal to 1.602 x 10-19 C Unit: Newton meter2 / coulomb2 volt meter / coulomb Note: Positive force is repulsive, negative force is attractive

  7. Charge flowing past a point in the interval [t0, t] is Electric Current, i Current (in amperes) (A) is the time rate of change of charge q 1 A = 1 C/s Convention: Direction of current flow is that of positive charges, opposite to the direction of electron flow

  8. Voltage The energy in joules (w) required to move a charge (q) of one coulomb through an element is 1 volt (V). 1 volt = 1 joule/coulomb = 1 newton meter/coulomb

  9. Power and Energy Power (p), in watts (W), is the time rate of expending or absorbing energy (w) in joules

  10. Power and Energy Change in energy from time t1 to time t2 Passive sign convention: If p > 0 power is absorbed by the element If p < 0 power is supplied by the element + -

  11. Circuit Elements Independent Voltage Sources

  12. Circuit Elements Independent Current Source

  13. Circuit Elements Dependent Voltage Sources

  14. Circuit Elements Dependent Current Sources

  15. Passive Circuit Elements i i i + -

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