Current | Direct Current | DC Current
" rate of flow of electrons "
Direction:
Conventional Current Direction Vs Electron Flow Direction
Representation & Unit:
I = dq / dt
1 Ampere (A) = 1 Coulomb / Sec
Explanation:
Measure:
Remember: Series Measurement
Step 1: Multimeter Knob in dc mA.
Step 2: Black Probe to resistor end.
Step 3: Red Probe to Battery's Positive Terminal.
Note: You can hold the terminals with bear hands. It will not give you any kind of electric shock.
Positive Current: Current direction is from red to black probe.
Negative Current: Current direction is from black to red probe.
Zero Current: Two reasons -
a) Circuit is discontinuous.
b) Current is very very small and multimeter is not able to measure it.
Experiments:
Measure the positive and negative current from any battery with multimeter.
Battery Name:_____________________________________________________________
Battery Use:_______________________________________________________________
+iv Current:_______________________________________________________________
-iv Current:_______________________________________________________________
Note: Use any resistance. If zero current change the resistance or battery and try again.
Current Effect & Uses:
Heating Effect: Flow of electric current through things generates heat.
Use - Electric Room Heater, Electric Oven, Electric Fire, ...
Magnetic Effect: Flow of electric current through things generate magnetic field.
Use - Electric Generators, Electric Motors, Relays, Speakers, ...