Free Printable Understanding Ohm's Law Calculations

1.

If a resistor has a resistance of $10\,\Omega$ and a current of $2\,A$ flows through it, what is the voltage across the resistor?

a)

$5\,V$

b)

$20\,V$

c)

$0.2\,V$

d)

$12\,V$

2.

A circuit has a voltage of $12\,V$ and a resistance of $4\,\Omega$ . What is the current flowing through the circuit?

a)

$3\,A$

b)

$48\,A$

c)

$0.33\,A$

d)

$16\,A$

3.

If the current through a $5\,\Omega$ resistor is $0.5\,A$ , what is the voltage across it?

a)

$2.5\,V$

b)

$10\,V$

c)

$0.1\,V$

d)

$5.5\,V$

4.

A resistor has a voltage of $9\,V$ across it and a current of $3\,A$ flowing through it. What is its resistance?

a)

$27\,\Omega$

b)

$3\,\Omega$

c)

$6\,\Omega$

d)

$12\,\Omega$

5.

If the resistance in a circuit is doubled and the voltage remains the same, what happens to the current?

a)

It doubles

b)

It halves

c)

It remains the same

d)

It becomes zero

6.

A $15\,\Omega$ resistor is connected to a $30\,V$ battery. What is the current through the resistor?

a)

$0.5\,A$

b)

$2\,A$

c)

$45\,A$

d)

$15\,A$

7.

If a current of $0.25\,A$ flows through a $40\,\Omega$ resistor, what is the voltage across the resistor?

a)

$10\,V$

b)

$16\,V$

c)

$0.00625\,V$

d)

$100\,V$

8.

A device draws $5\,A$ of current when connected to a $120\,V$ supply. What is its resistance?

a)

$24\,\Omega$

b)

$600\,\Omega$

c)

$0.0417\,\Omega$

d)

$115\,\Omega$

9.

If the voltage across a resistor is $18\,V$ and the resistance is $6\,\Omega$ , what is the current?

a)

$3\,A$

b)

$0.33\,A$

c)

$12\,A$

d)

$108\,A$

10.

A wire has a resistance of $8\,\Omega$ and a current of $1.5\,A$ flows through it. What is the voltage across the wire?

a)

$12\,V$

b)

$8\,V$

c)

$10.5\,V$

d)

$6.5\,V$

Understanding Ohm's Law Calculations

Total questions: 10

Worksheet time: 5mins

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