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# Unit 3: Electricity

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## About this unit

We can't imagine our lives without electricity. But what exactly is electricity? How does electricity light up our houses? What does a battery do? What is the cost of electricity? We will answer all these questions in this chapter.### Learn

### Practice

- Finding electric currentGet 3 of 4 questions to level up!

### Learn

### Practice

- Voltage and workGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Practice

- Resistance and resistivityGet 5 of 7 questions to level up!

### Learn

### Practice

- Finding equivalent resistanceGet 3 of 4 questions to level up!
- Identifying types of resistor combinationsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Simplifying resistor networksGet 3 of 4 questions to level up!
- Finding currents and voltages (pure circuits)Get 3 of 4 questions to level up!
- Finding currents and voltages (mixed circuits)Get 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Electric power (formula)Get 3 of 4 questions to level up!
- Calculating heat dissipated in circuitsGet 3 of 4 questions to level up!

### Practice

- Bulbs connected in series or parallelGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

Up next for you:

Level up on all the skills in this unit and collect up to 1300 Mastery points!