practical electricity

What is power?

• The rate of doing work

• The total energy consumed

• The amount of force applied

• The speed of energy transfer

What is the SI unit for power?

• Volt

• Ampere

• Ohm

• Watt

Which of the following formulas represents electrical energy (E)?

• E = VIt

• E = VI

• E = I²R

• E = V²/R

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Which formula is used to calculate electrical power (P) based on potential difference (V) and current (I)?

• P = VIt

• P = VI

• P = I²R

• P = V²/R

An electric kettle connected to a 220V mains supply draws a current of 10A. What is the power of the kettle?

• 22 W

• 220 W

• 2200 W

• 22000 W