Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_47 (frequency VARCHAR, voltage VARCHAR)
### Question:
What is the Frequency, when the Voltage is 3.3 V?
### Answer:
SELECT frequency FROM table_name_47 WHERE voltage = "3.3 v"