- Ohm's Law defines the relationship between voltage, current, and resistance in electrical circuits. It states that current is directly proportional to voltage and inversely proportional to resistance. - The document provides examples of solving circuit problems using Ohm's Law and defines common circuit components and their symbols. - Key circuit concepts covered include voltage, current, resistance, series and parallel circuits, and applying calculations for current, voltage, and resistance.

2. • Define Ohm’s Law,
• Explain the relationship between
voltage, current and resistance,
• Solve problems using Ohm’s
Law, and
• Practice accuracy in
computation.

3. Which of these circuits
would work? Why?
A B C

4. A plastic comb
is not a
conductor of
electricity.
A plastic
toothbrush
is not a conductor
of electricity, and
a power source is
missing.
A metal screw is a
conductor of
electricity,
but the power
source
is missing.
Which of these circuits
would work?
ANSWER
KEY

5. A simple circuit consists of a
battery (or other source), a
light bulb (or other load) and
conducting wires.
COMPONENT
SYMBOL
Actual
Symbol

6. Shown below are other
circuit components and
their corresponding
electrical symbols:
battery closed switch open switch
resistor motor fuse

7. By convention,
current is defined
as flowing from
+ to –. Electrons
actually flow in
the opposite
direction.

8. States that the
current in the
circuit is directly
proportional to
the voltage and
inversely
proportional to its
resistance

9. Voltage – volts (V)
Current – ampere (A)
Resistance – ohms (Ω)

10. An alarm clock draws 0.5 A of
current when connected to a
120 volt circuit. Calculate its
resistance.

11. A light bulb has a resistance of 5
ohms and a maximum current
of 10 A. How much voltage can
be applied before the bulb will
break?

12. • design, analysis, and troubleshooting
of electrical circuits, ensures safety,
and plays a crucial role in the efficient
operation of electrical systems
• fundamental principle for anyone
working with electricity

13. 1. A 12 Volt car battery pushes
charge through the headlight
circuit resistance of 10 ohms.
How much current is passing
through the circuit?

14. 2. A 2.2 kΩ resistor has 15 mA
current passing through it. Find
the value of the connected
voltage source.

15. 3. Two lamps, each having
resistance of 3 ohms connects
in series. What current will flow
if a voltage source of 5 V is
connected at input.

18. 1. 1.2 A
2. 33 V
3. 0.83 A