CURRENT ELECTRICITY 1

Considered Formulas



Example 1
Two resistors have resistances 3 W and 5 W connected in series. Find the total resistance of the resistors

 Example 2
Two resistors of resistances 10 W and 5 W are connected as shown below.
Solution
Example 3
A circuit of two resistors 4 W and 6 W  are connected in parallel. 

 Example 4
Two resistors of resistances 4 W and 1 W are connected as shown below.

Example 5
A diagram below shows a three resistors of resistance 3 W, 5 W and 6 W as connected as shown below.
 

Example 6
A battery is 5 V has a resistance wire of 20Ω connected across it. Calculate the current in the circuit.

Example 7
Consider the figure below, 
 

EXERCISE

  1. A circuit of two resistors 7 W and 9 W  are connected in parallel. Find the equivalent resistance.
  2. Two resistors are connected as shown below.
    3.  Find the total resistance
  3. A diagram below shows a four resistors of resistance 2 W each are as connected as shown below.
    4. Find the equivalent resistance
    a)      Between A and B
    b)      Between A and Y
    c)       Between X and B
    d)      Between X and Y
  4. Four resistors of resistance 1 W, 2 W, 3 W, and 4 W, are connected as shown below.
    5. Find the total resistance
  5. A battery is 12V has a resistance wire of 8Ω connected across it. Calculate the current in the circuit.
  6. A current of 2A flows through two resistors 2 Ω and 3 Ω connected in series. Calculate the potential difference across the resistors
  7. The resistance between two points is 15 ohms and the current is 10 amperes. What is the potential difference?
  8. What is the current when the voltage is 200 volts across a 10 ohms’ resistor?
  9. What is the resistance of a lamp if it draws 0.25 A from a 110V line?
  10. Consider the figure below, 
    11. Calculate electric current flowing through the circuit
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