Answer:
Explanation:
Given:
- power of battery,
- voltage across the load resistor,
- emf of the battery,
<u>Now as we know that the electric power is given as:</u>
here: resistance of the load
a)
Now the load resistance:
b)
Using Ohm's law, current in the load:
Now,
where: internal resistance
Despite current has a magnitude and a direction, like vectors, it is a scalar because it doesn't obey laws of vector addition. For instance, if we consider a junction of
in a circuit, and two currents entering this junction, we know that the resultant current is just the algebraic sum of the two currents, not the vector sum, so it is not a vector quantity.
Answer:
Frequency is expressed in Hertz, which is simply cycles per second. If a tuning fork (or anything else, for that matter) vibrates 1 time each second, it's frequency is 1 Hz. So then, if it vibrates 4280 in 20 seconds, then 4280÷20=214 cycles per second = 214 Hz.
Explanation: