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Breadboard and Multimeter Skills (Hands-on Practice)

Describe the direction of charge flow in conventional current. Use drift velocity to calculate current and vice versa. Electric current is defined to be the rate at which charge flows. A large current, such as that used to start a truck engine, moves a large amount of charge in a small time, whereas a small current, such as that used to operate a hand-held calculator, moves a small amount of charge over a long period of time. In equation form, electric current I is defined to be where ΔQ is the amount of charge passing through a given area in time Δt .

Figures (10)

V, I, and R, the parameters of Ohm's law
Internal resistance model
Drude Model electrons (shown here in blue) constantly bounce among heavier, stationary crystal ions (shown in red).
Covering the unknown in the Ohm's law image mnemonic gives the formula in terms of the remaining parameters.
Ohm's law wheel with international unit symbols
Current flowing through a uniform cylindrical conductor (such as a round wire) with a uniform field applied
Analog multimeter
Digital multimeter
1920s pocket multimeter
Avometer Model 8

Key Points

  • A breadboard, solderless breadboard, or protoboard is a construction base used to build semi-permanent prototypes of electronic circuits.
  • The meter movement in a moving pointer analog multimeter is practically always a moving-coil galvanometer of the d'Arsonval type, using either jeweled pivots or taut bands to support the moving coil.

Terms

Tap a term for a plain-language explanation.

Sources & licensing(4)