A 12\(\Omega\) resistor dissipates 8kJ of heat in 20s. Ca...
A 12\(\Omega\) resistor dissipates 8kJ of heat in 20s. Calculate the current through the resistor
5.8A
6.9A
30.0A
33.3A
Correct answer is A
Q = I2Rt
I = \(\sqrt{\frac{Q}{Rt}}\)
= \(\sqrt{\frac{8000}{12 \times 20}}\)
= 5.8
In measuring high frequency a.c, the instrument used is the ...
Which of the following statements on the use of X-rays is incorrect? X-rays are used ...
Which of the following is not luminous object? ...
A short response time is obtained in a liquid-in-glass thermometer when the ...
In which of the following fields is radioisotopes not used? ...