How to Calculate the Resistance Needed for an Electronic Toy Buzzer
What is the current required by the buzzer in the electronic toy?
The buzzer requires 30 mA (.03 amps) of current.
What is the voltage from the batteries for the toy?
The voltage from the batteries for the toy add up to 12 volts.
What sized resistor must be used to ensure the buzzer receives the necessary current?
Enter the numerical value rounded to the nearest whole number.
Answer:
The resistor needed to ensure the buzzer receives the necessary 30 mA of current is 400 Ohms.
When building an electronic toy, it is important to calculate the resistance needed to ensure the components receive the correct amount of current. In this case, the buzzer in the toy requires 30 mA of current and the batteries provide 12 volts of power.
Using Ohm's Law, which states that resistance (R), current (I), and voltage (V) are related by the equation R=V/I, we can calculate the resistance needed for the buzzer. Plugging in the values we have:
R = V/I
R = 12 V / 0.03 A
R = 400 Ohms
Therefore, the resistance needed for the buzzer in the electronic toy is 400 Ohms. By using the correct resistor, the buzzer will receive the necessary 30 mA of current to function properly.