1.2 - Bulbs
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Practice Questions
Test your understanding with targeted questions
What is the hot resistance of a 6V, 0.3A incandescent bulb?
💡 Hint: Use the formula R = V/I.
What is the cold resistance of a typical incandescent bulb?
💡 Hint: It’s based on the hot resistance divided by a certain ratio.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What characteristic increases for incandescent bulbs as temperature rises?
💡 Hint: Think about how heat affects materials.
LEDs require a current limiting resistor to operate safely. True or False?
💡 Hint: Consider why current needs to be controlled.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Design a circuit with three LEDs, each having a forward voltage of 2.0V, connected to a 12V power supply. Calculate resistor values for each to maintain a current of 25mA.
💡 Hint: Apply the formula for each LED individually.
If you replace an incandescent bulb in a circuit with two parallel LEDs, calculate the total current drawn if each LED has a forward voltage of 2V from a 12V supply.
💡 Hint: Calculate each LED separately first.
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