# EMF, Potential Difference And Current

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Quizzes Created: 1 | Total Attempts: 403
Questions: 8 | Attempts: 404  Settings  explain and apply the concept of ‘electric current’ as the rate of flow of electric charge in an electric field—this will include applying the relationship: I=q/t
state that the direction of conventional current is that in which the flow of positive charge takes place, while the electron flow is in the opposite direction  Explain and apply the concepts of EMF and ‘potential difference’ as the loss of potential energy of electric charges as they flow through a circuit

• 1.

### A charge of 2 C flows through a wire over a period of 10 s. What is the current?

• A.

20 A

• B.

0.2 A

• C.

0.02 A

• D.

2.0 A

B. 0.2 A
Explanation
The current can be calculated by dividing the charge (2 C) by the time (10 s). Therefore, the current is 0.2 A.

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• 2.

### A charge of 2.5 C flows through a wire over a period of 5 s. What is the current?

• A.

50 A

• B.

0.5 A

• C.

10 A

• D.

0.1 A

B. 0.5 A
Explanation
The current can be calculated using the formula I = Q/t, where I is the current, Q is the charge, and t is the time. In this case, the charge is 2.5 C and the time is 5 s. Plugging these values into the formula, we get I = 2.5 C / 5 s = 0.5 A. Therefore, the correct answer is 0.5 A.

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• 3.

### A charge of 4 C flows through a wire over a period of 12 s. What is the current?

• A.

3 A

• B.

0.33 A

• C.

0.03 A

• D.

30 A

B. 0.33 A
Explanation
The current can be calculated using the formula I = Q/t, where I is the current, Q is the charge, and t is the time. In this case, the charge is 4 C and the time is 12 s. Substituting these values into the formula, we get I = 4 C / 12 s = 0.33 A. Therefore, the current is 0.33 A.

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• 4.

### A globe has a potential difference of 4 V. The current flowing through it is 2 A. How much energy is transferred to the globe in 30 s? Include units.

240J
240 J
Explanation
The energy transferred to the globe can be calculated using the formula: energy (E) = potential difference (V) x current (I) x time (t). Plugging in the given values, we get E = 4 V x 2 A x 30 s = 240 J. Therefore, the correct answer is 240J.

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• 5.

### A globe has a potential difference of 5 V. The current flowing through it is 1 A. How much energy is transferred to the globe in 30 s? Include units.

150J
150 J
Explanation
The energy transferred to the globe can be calculated using the formula: Energy = Potential difference × Current × Time. Given that the potential difference is 5 V, the current is 1 A, and the time is 30 s, we can substitute these values into the formula: Energy = 5 V × 1 A × 30 s = 150 J. Therefore, the energy transferred to the globe in 30 s is 150 Joules.

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• 6.

### A globe has a potential difference of 12 V. The current flowing through it is 4 A. How much energy is transferred to the globe in 30 s? Include units.

1440J
1440 J
Explanation
The energy transferred to the globe can be calculated using the formula: Energy = Voltage x Current x Time. Given that the potential difference is 12 V, the current is 4 A, and the time is 30 s, we can substitute these values into the formula. Energy = 12 V x 4 A x 30 s = 1440 J. Therefore, the energy transferred to the globe in 30 s is 1440 J.

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