A resistor, with a potential difference of 210 V across it, transfers electrical energy to thermal energy at the rate of 3030 W. What is the resistance of the resistor?

R=14.55 ohm

Explanation:

Given that

Potential difference ,ΔV = 210 V

Energy ,P = 3030 W

Lets take the resistance = R

We know that energy P is given as

Now by putting the values in the above equation we get

R=14.55 ohm  

That is why the resistance of the resistor will be 14.55 ohm.

14.6ohms

Explanation:

Potential difference(v)=210V

rate of energy=power(p)=3030watts

Resistance(r)=?

r=v^2/p

r=(210)^2/3030

r=44100/3030

r=14.6ohms

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.