Question

1. Electrons in an X-ray tube are accelerated through 103 kV and directed toward a target to produce X-rays. Calculate the power of the electron beam in this tube if it has a current of 19.2 mA.

2. A charge of 3.6 C of charge passes through a pocket calculator’s solar cells in 3.9 h. What is the power output in mW, given the calculator’s voltage output is 3.4 V?

3. What is the current when a typical static charge of 0.256 μC moves from your finger to a metal doorknob in 0.96 μs ?

4. What current, in milliamps, flows through a 2.3 cm diameter rod of pure silicon that is 18.2 cm long, when 0.94 × 10³ V is applied to it? The resistivity of silicon is 2300 Ωm.

5. How many volts are supplied to operate an indicator light on a DVD player that has a resistance of 162 Ω , given that 21.1 mA passes through it?

Answer 1