help please in my project.. about calculating voltage..... thanks!!?

Question

1. On the base of a bulb is written: 3V, 0.15A. What does this mean?
What will happen if this bulb is connected to a 1.5V cell??

What will happn if it is connected to a 4.5 V battery??

2. For the same voltage, what happens to a current when power is doubled??
what is the power when current is halved???

thanks of answers..!

Answer 1

1. The bulb draws 0.15 A when 3 V is applied. A lamp bulb is like a resistor, but the resistance is nonlinear; it increases with increasing temperature. If you apply 1.5 V it would draw 0.075 A if linear, but will actually draw more than that. If you apply 4.5 V it would draw 0.225 A if linear, but will actually draw less than that.
2. Doubling power doubles the current when voltage remains constant. In a linear resistor, halving the current also halves the voltage, reducing power to 1/4 the previous value. However, if this is also a "for the same voltage" question, power is halved.

Answer 2

while 2 voltages are shown it skill that the kit is able to being switched to be powered from the two. If the article (like a working laptop or laptop video show) is hardship-loose to be plugged into 120V then use the stated modern or the present shown on its call-tag and combine it with that voltage to calculate skill. The corresponding voltage and modern if it became run on the different achievable voltage might calculate out to a similar skill quantity besides.