We read your photo as:
Qbb. State the Power laws in vehicle electrical and electronic. Qbb. Suppose a window defogger heater draws 20A when connected to a 12V battery source. What is the amount of power dissipated by the heater? Q7. Draw a neat sketch of ignition module + transistor to switch primary current ON/OFF.

July 10, 2026Physics
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Q6a: State the Power law in vehicle electrical and electronic.
The Power Law in vehicle electrical and electronic systems states that the electrical power ( $P$ ) dissipated by a component is equal to the product of the voltage ( $V$ ) across it and the current ( $I$ ) flowing through it.
P = V \times I
Where:
$P$ is power in watts (W)
$V$ is voltage in volts (V)
$I$ is current in amperes (A)
Q6b: Suppose a window defogger heater draws 20A when connected to a 12V battery source. What is the amount of power dissipated by the heater.
Step 1: Identify the given values.
The current ( $I$ ) drawn by the heater is $20 \text{ A}$ .
The voltage ( $V$ ) of the battery source is $12 \text{ V}$ .
Step 2: Apply the Power Law formula.
The formula for power dissipated is $P = V \times I$ .
Step 3: Substitute the values and calculate the power.
P = 12 \text{ V} \times 20 \text{ A}
P = 240 \text{ W}
The amount of power dissipated by the heater is $\boxed{\text{240 W}}$ .
Q7: Draw a neat sketch of Ignition module and a transistor to switch Primary Current ON and OFF.
An ignition module uses a power transistor to rapidly switch the primary current of the ignition coil on and off. This switching action induces a high voltage in the secondary winding of the coil, which then fires the spark plugs.
Here is a conceptual sketch:
      +12V (Battery)
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      [Ignition Switch]
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        o----- Primary Winding of Ignition Coil -----o
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Qbb. State the Power laws in vehicle electrical and electronic. Qbb. Suppose a window defogger heater draws 20A when connected to a 12V battery source. What is the amount of power dissipated by the heater? Q7. Draw a neat sketch of ignition module + transistor to switch primary current ON/OFF.

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