## Series & Parallel Answers

## 1. A resistor that can be changed without a change of temperature or light intensity is called what?

## A variable resistor

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## 2. Two bulbs are connected in a series circuit. One of the bulb breaks, what will happen to the other bulb?

## The bulb would also blow

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## 3. If the temperature of a thermistor is decreased, what will happen to the resistance of the thermistor?

## It will decrease

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## 4. What is the combined resistance of a 25 Ω and a 30 Ω resistor connected in series?

## The resistance would be 55 Ω

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## 5. What is the combined resistance of a 2 Ω and a 3 Ω resistor connected in series?

## The resistance would be 5 Ω

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## 6. What happens to the voltage in a parallel circuit?

## A - It stays the same throughout

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## 7. How do you calculate the total resistance in a series circuit?

## Add all of the resistances across the circuit together to calculate the total resistance.

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## 8. Two bulbs are connected in parallel and one of them blows, what will happen to the other bulb?

## The bulb stays lit

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## 9. When more lamps are connected in series, do they get:

## A - Dimmer

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## 10. How do you calculate the total resistance for components in a parallel circuit?

## By using the formula 1/R total = 1/R1 + 1/R2 + 1/R3

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