CBSE Class 10: Ohm's Law Videos | Electricity

• write ohm's law for electric circuit. Also write the necessary formula for this .
• The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value.State the change that will occur in the current through it.
• What is the basic principle of Ohm's law?
• what is resistivity
• photo attached 
  
• explain ohm s law
• An electric iron has a rating of 750w,220v, calculate the current flowing through it and its resistance when in use
• Study the VI graph for a resistor as shown in the figure and prepare a table showing the values of I (in amperes) corresponding to four different values of V (in volts). Find the value of current for V = 10 volts. How can we determine the resistance of the resistor from this graph?
  
• what is the unit of resistivity?
• a potential difference of 10 volt is needed to make a current of 0.02 impair for flow through a wire. what potential difference is needed to make a current of 250 mili ampere flows through the same wire

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