CHAPTER 2 PHYSICS FOR JUNIOR HIGH SCHOOL IX. CLOSED ELECTRICAL CIRCUIT Closed electrical circuit is...
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Transcript of CHAPTER 2 PHYSICS FOR JUNIOR HIGH SCHOOL IX. CLOSED ELECTRICAL CIRCUIT Closed electrical circuit is...
CHAPTER 2
PHYSICS FOR JUNIOR HIGH SCHOOL IX
OPEN AND CLOSED ELECTRICAL CIRCUIT
PHYSICS FOR JUNIOR HIGH SCHOOL IX
CLOSED ELECTRICAL CIRCUIT
Closed electrical circuit is electric current in a circuit that can only flow in closed circuit.
PHYSICS FOR JUNIOR HIGH SCHOOL IX
CLOSED ELECTRICAL CIRCUIT
a. The connectivity between current, potential difference, and resistance.
To see how they influence each other, George Simone Ohm (1789–1854) researched the connectivity between electrical potential (V), current (I), and Resistance (R). Mathematically, it can be stated as follows :
b. Specific resistanceResistance value of one medium depends on the following factors :
Wire length, the longer the wire, the bigger the resistance. Wire surface-are, the bigger the surface-area, the smaller
the resistance. Types of substance.
PHYSICS FOR JUNIOR HIGH SCHOOL IX
CLOSED ELECTRICAL CIRCUIT
Here are some types of resistor in electricalcircuit : rheostat Colored-belt resistor Potentiometer
Specicfic resistence is a special property of one substance: conductor, isolator, semiconductor Conductor is anything that can flow electrical
current well. Isolator is anything that can’t flow electrical
current. Semiconductor is anything whose property
between conductor and isolator.
PHYSICS FOR JUNIOR HIGH SCHOOL IX
CLOSED ELECTRICAL CIRCUIT
d. Ohm laws in closed electrical circuit
Current in that circuit can be counted by Ohm laws
PHYSICS FOR JUNIOR HIGH SCHOOL IX
OPEN ELECTRICAL CIRCUIT
B. OPEN CIRCUITOpen circuit is the contrary of closed circuit, in this circuit, there’s no any voltage difference. So that no electron movement that causes no electrical current. In this circuit, electron can not move to positive pole of voltage source, because it should not connect each other (disturbed). Lamp turned
offSwitch opened
PHYSICS FOR JUNIOR HIGH SCHOOL IX
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