Energy and voltage in circuits

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Question 39
Medium

There are 15 identical decorative LEDs connected in series with a 12 V power supply.

a.

What is the voltage across each LED in the series circuit?

[1]
b.

Each LED has a power of 2.0 W. State the equation linking power, current, and voltage.

[1]
c.

Show that the current in the circuit is 2.5 A.

[2]
d.

The LEDs are switched on for 6 hours a day for 4 days. Calculate the total energy transferred during this time in joules (J).

[3]
e.

Describe the main energy transfers that take place in each LED when they are connected to the power supply.

[2]

Energy and voltage in circuits Questions

  1. IGCSE
  2. /Physics
  3. /Energy and voltage in circuits