Ohms law

• Ohm's Law: V = IR
• Resistance: amount of opposition of a medium to any flow or charges
• Resistance is measured in ohms
• Resistors: material presents resistance to electric current
• The resistance of any conductors (R) depends on the resistivity (p), length (l) and cross-sectional area (A) of the conductors
• I=V/R, R= V/I, V=RI
• Series resistors are connected in a series or parallel.
• Series resistors are connected one after the other, parallel one are those where the corresponding terminals are connected to two separate points.
• The equivalent resistance (R eq) of a resistors in a series is greater than that of any resistors connected in a network
• the equivalent (Req) of resistors in a parallel is less than any of the resistors in a network.
• A series connection provides only one conducting path, while parallel connection provides several paths.
• The current through the series resistors is the same, but the voltages across resistors may not be equal. Voltages are equal only when resistors have the same resistance.
• For parallel resistors, the voltages across the resistors are equal while current may not be the same. The currents will only be the same if the resistors have equal resistors.
• Ammeter have negligible resistance so it will not cast any effect on the circuit.
• Voltmeter: use to measure voltage across resistors.
• Ammeter: must be connected in series with resistors
• Voltage must be connected in a parallel to the resistors