Chapter 3: Ohm's Law, Energy and Power

What is the voltage is the current is 5mA and the resistor is 50 ohm?

• 25 mV

• 250 mV

• 25 V

• 0.25 mV

Which of the following are the formulas for Power

• P = VI

• P = I²R

• P = W / t

• P = V² / R

How many kWh is used, if we use 2500W for 2hours?

• 5 kWh

• 0.5 kWh

• 5 Wh

• 50kWh

What is the resistance, if the voltage and current passing through the resistor is 12V and 3A respectively

• 36 Ohm

• 0.25 Ohm

• 4 Ohm

• 3.6 Ohm

It is important to selecting the correct power rating for resistor.

• True

• False

What power rating of the resistor should we use. If the circuit consist of a 1000 ohm resistor with 10mA passing through it.

• 1W

• 0.5W

• 0.25W

• 0.125W