Understanding Electric Circuits and Safety

Understanding Electric Circuits and Safety

3rd Grade

30 Qs

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Understanding Electric Circuits and Safety

Understanding Electric Circuits and Safety

Assessment

Quiz

Physics

3rd Grade

Practice Problem

Easy

Used 1+ times

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30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

O que a resistência elétrica faz em um circuito?

Ela ajuda a eletricidade a fluir mais rápido.

Ela diminui o fluxo de eletricidade.

Ela deixa o circuito mais brilhante.

Ela transforma eletricidade em água.

Answer explanation

Electrical resistance slows down the flow of electricity in a circuit. It opposes the movement of electrons, which can lead to reduced current and energy dissipation as heat.

2.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

Qual destes é um bom condutor de eletricidade?

Plástico

Madeira

Cobre

Vidro

Answer explanation

Copper is a good conductor of electricity due to its high electrical conductivity, allowing electric current to flow easily. In contrast, plastic, wood, and glass are insulators and do not conduct electricity well.

3.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

Qual é o símbolo de uma bateria em um diagrama simples de circuito?

Uma linha em zigue-zague

Duas linhas paralelas, uma mais longa que a outra

Um círculo com uma cruz dentro

Um triângulo

Answer explanation

In circuit diagrams, a battery is represented by two parallel lines, where one line is longer than the other. The longer line symbolizes the positive terminal, while the shorter line represents the negative terminal.

4.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

Qual é o principal efeito da corrente elétrica em uma lâmpada?

Ela faz a lâmpada ficar fria.

Ela faz a lâmpada acender.

Ela faz a lâmpada desaparecer.

Ela faz a lâmpada ficar mais pesada.

Answer explanation

The main effect of electric current in a light bulb is that it makes the bulb light up. The current heats the filament, causing it to emit light, which is the primary function of a light bulb.

5.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

Qual material é um isolante?

Ferro

Prata

Borracha

Ouro

Answer explanation

Rubber is an insulator, meaning it does not conduct electricity well. In contrast, iron, silver, and gold are all conductive metals, making rubber the correct choice for an insulator.

6.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

O que a Lei de Ohm relaciona?

Tensão, corrente e resistência

Massa, velocidade e tempo

Temperatura, cor e tamanho

Som, luz e calor

Answer explanation

Ohm's Law relates voltage, current, and resistance in an electrical circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points, with resistance as the proportionality constant.

7.

MULTIPLE CHOICE QUESTION

1 min • 4 pts

Qual é a fórmula da Lei de Ohm?

Answer explanation

Ohm's Law states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, the correct formula is V = I × R, making this the right choice among the options provided.

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